chore: add Construct Hub link to cfn-only packages (#19896)

Rewrite the README content for CFN-only packages a little.

Most importantly: add search links directly into Construct Hub, to raise
CH awareness and give people an obvious way to look for libraries that
we don't have L2s for yet (lifting the load off of accepting L2s as
into alpha status prematurely).


----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/alexa-ask/README.md

@@ -21,10 +21,11 @@ import * as alexa_ask from '@aws-cdk/alexa-ask';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for ASK construct libraries](https://constructs.dev/search?q=ask)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation Alexa::ASK resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Alexa_ASK.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for Alexa::ASK](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Alexa_ASK.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-accessanalyzer/README.md

@@ -21,10 +21,11 @@ import * as accessanalyzer from '@aws-cdk/aws-accessanalyzer';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AccessAnalyzer construct libraries](https://constructs.dev/search?q=accessanalyzer)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AccessAnalyzer resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AccessAnalyzer.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AccessAnalyzer](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AccessAnalyzer.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-amazonmq/README.md

@@ -21,10 +21,11 @@ import * as amazonmq from '@aws-cdk/aws-amazonmq';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AmazonMQ construct libraries](https://constructs.dev/search?q=amazonmq)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AmazonMQ resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AmazonMQ.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AmazonMQ](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AmazonMQ.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-amplifyuibuilder/README.md

@@ -21,10 +21,11 @@ import * as amplifyuibuilder from '@aws-cdk/aws-amplifyuibuilder';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AmplifyUIBuilder construct libraries](https://constructs.dev/search?q=amplifyuibuilder)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AmplifyUIBuilder resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AmplifyUIBuilder.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AmplifyUIBuilder](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AmplifyUIBuilder.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-appconfig/README.md

@@ -21,10 +21,11 @@ import * as appconfig from '@aws-cdk/aws-appconfig';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AppConfig construct libraries](https://constructs.dev/search?q=appconfig)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AppConfig resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppConfig.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AppConfig](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppConfig.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-appflow/README.md

@@ -21,10 +21,11 @@ import * as appflow from '@aws-cdk/aws-appflow';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AppFlow construct libraries](https://constructs.dev/search?q=appflow)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AppFlow resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppFlow.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AppFlow](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppFlow.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-appintegrations/README.md

@@ -21,10 +21,11 @@ import * as appintegrations from '@aws-cdk/aws-appintegrations';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AppIntegrations construct libraries](https://constructs.dev/search?q=appintegrations)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AppIntegrations resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppIntegrations.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AppIntegrations](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppIntegrations.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-applicationinsights/README.md

@@ -21,10 +21,11 @@ import * as applicationinsights from '@aws-cdk/aws-applicationinsights';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for ApplicationInsights construct libraries](https://constructs.dev/search?q=applicationinsights)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::ApplicationInsights resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_ApplicationInsights.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::ApplicationInsights](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_ApplicationInsights.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-appstream/README.md

@@ -21,10 +21,11 @@ import * as appstream from '@aws-cdk/aws-appstream';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AppStream construct libraries](https://constructs.dev/search?q=appstream)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AppStream resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppStream.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AppStream](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AppStream.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-aps/README.md

@@ -21,10 +21,11 @@ import * as aps from '@aws-cdk/aws-aps';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for APS construct libraries](https://constructs.dev/search?q=aps)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::APS resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_APS.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::APS](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_APS.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-athena/README.md

@@ -21,10 +21,11 @@ import * as athena from '@aws-cdk/aws-athena';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for Athena construct libraries](https://constructs.dev/search?q=athena)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::Athena resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_Athena.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::Athena](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_Athena.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-auditmanager/README.md

@@ -21,10 +21,11 @@ import * as auditmanager from '@aws-cdk/aws-auditmanager';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AuditManager construct libraries](https://constructs.dev/search?q=auditmanager)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AuditManager resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AuditManager.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AuditManager](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AuditManager.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
 

packages/@aws-cdk/aws-autoscalingplans/README.md

@@ -21,10 +21,11 @@ import * as autoscalingplans from '@aws-cdk/aws-autoscalingplans';
 
 <!--BEGIN CFNONLY DISCLAIMER-->
 
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+There are no official hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. Here are some suggestions on how to proceed:
+
+- Search [Construct Hub for AutoScalingPlans construct libraries](https://constructs.dev/search?q=autoscalingplans)
+- Use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, in the same way you would use [the CloudFormation AWS::AutoScalingPlans resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AutoScalingPlans.html) directly.
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::AutoScalingPlans](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_AutoScalingPlans.html).
 
 (Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)