Archive Gateway documentation before 2.x (#3892)

* move everything before 2.0 into an archive directory
* set archive version to 2.0; link to archive netlify site
* add missing menu entry for enterprise dropdown
* update enterprise version
* Fix version switcher smoke tests

Co-authored-by: Michael Heap <m@michaelheap.com>

archive/gateway-oss/1.4.x/getting-started/adding-consumers.md

@@ -5,7 +5,7 @@ title: Adding Consumers
 <div class="alert alert-warning">
   <strong>Before you start:</strong>
   <ol>
-    <li>Make sure you've <a href="https://konghq.com/install">installed Kong</a> &mdash; It should only take a minute!</li>
+    <li>Make sure you've <a href="https://konghq.com/install/">installed Kong</a> &mdash; It should only take a minute!</li>
     <li>Make sure you've <a href="/{{page.kong_version}}/getting-started/quickstart">started Kong</a>.</li>
     <li>Also, make sure you've <a href="/{{page.kong_version}}/getting-started/configuring-a-service">configured your Service in Kong</a>.</li>
   </ol>
@@ -84,7 +84,7 @@ Plugins, feel free to read more on Kong in one of the following documents:
 - [Admin API Reference][API]
 - [Clustering Reference][cluster]
 
-Questions? Issues? Contact us on one of the [Community Channels](https://konghq.com/community)
+Questions? Issues? Contact us on one of the [Community Channels](https://konghq.com/community/)
 for help!
 
 [key-auth]: /plugins/key-authentication

archive/gateway-oss/1.4.x/getting-started/enabling-plugins.md

@@ -5,7 +5,7 @@ title: Enabling Plugins
 <div class="alert alert-warning">
   <strong>Before you start:</strong>
   <ol>
-    <li>Make sure you've <a href="https://konghq.com/install">installed Kong</a> - It should only take a minute!</li>
+    <li>Make sure you've <a href="https://konghq.com/install/">installed Kong</a> - It should only take a minute!</li>
     <li>Make sure you've <a href="/{{page.kong_version}}/getting-started/quickstart">started Kong</a>.</li>
     <li>Also, make sure you've <a href="/{{page.kong_version}}/getting-started/configuring-a-service">configured your Service in Kong</a>.</li>
   </ol>

archive/gateway-oss/1.5.x/getting-started/adding-consumers.md

@@ -5,7 +5,7 @@ title: Adding Consumers
 <div class="alert alert-warning">
   <strong>Before you start:</strong>
   <ol>
-    <li>Make sure you've <a href="https://konghq.com/install">installed Kong</a> &mdash; It should only take a minute!</li>
+    <li>Make sure you've <a href="https://konghq.com/install/">installed Kong</a> &mdash; It should only take a minute!</li>
     <li>Make sure you've <a href="/{{page.kong_version}}/getting-started/quickstart">started Kong</a>.</li>
     <li>Also, make sure you've <a href="/{{page.kong_version}}/getting-started/configuring-a-service">configured your Service in Kong</a>.</li>
   </ol>
@@ -84,7 +84,7 @@ Plugins, feel free to read more on Kong in one of the following documents:
 - [Admin API Reference][API]
 - [Clustering Reference][cluster]
 
-Questions? Issues? Contact us on one of the [Community Channels](https://konghq.com/community)
+Questions? Issues? Contact us on one of the [Community Channels](https://konghq.com/community/)
 for help!
 
 [key-auth]: /plugins/key-authentication

archive/gateway-oss/1.5.x/getting-started/configuring-a-service.md

@@ -5,7 +5,7 @@ title: Configuring a Service
 <div class="alert alert-warning">
   <strong>Before you start:</strong>
   <ol>
-    <li>Make sure you've <a href="https://konghq.com/install">installed Kong</a> &mdash; It should only take a minute!</li>
+    <li>Make sure you've <a href="https://konghq.com/install/">installed Kong</a> &mdash; It should only take a minute!</li>
     <li>Make sure you've <a href="/{{page.kong_version}}/getting-started/quickstart">started Kong</a>.</li>
   </ol>
 </div>

archive/gateway-oss/1.5.x/getting-started/enabling-plugins.md

@@ -5,7 +5,7 @@ title: Enabling Plugins
 <div class="alert alert-warning">
   <strong>Before you start:</strong>
   <ol>
-    <li>Make sure you've <a href="https://konghq.com/install">installed Kong</a> - It should only take a minute!</li>
+    <li>Make sure you've <a href="https://konghq.com/install/">installed Kong</a> - It should only take a minute!</li>
     <li>Make sure you've <a href="/{{page.kong_version}}/getting-started/quickstart">started Kong</a>.</li>
     <li>Also, make sure you've <a href="/{{page.kong_version}}/getting-started/configuring-a-service">configured your Service in Kong</a>.</li>
   </ol>

archive/gateway-oss/1.5.x/getting-started/introduction.md

@@ -3,7 +3,7 @@ title: Welcome to Kong
 ---
 
 <div class="alert alert-warning">
-  <strong>Before you start:</strong> Make sure you've <a href="https://konghq.com/install">installed Kong</a> &mdash; It should only take a minute!
+  <strong>Before you start:</strong> Make sure you've <a href="https://konghq.com/install/">installed Kong</a> &mdash; It should only take a minute!
 </div>
 
 This guide is going to take you through a quick introduction on how to use Kong and perform basic operations such as:

archive/gateway-oss/1.5.x/getting-started/quickstart.md

@@ -4,7 +4,7 @@ title: 5-minute Quickstart
 
 <div class="alert alert-warning">
   <strong>Before you start:</strong> Make sure you've
-  <a href="https://konghq.com/install">installed Kong</a> &mdash; It should only take a minute!
+  <a href="https://konghq.com/install/">installed Kong</a> &mdash; It should only take a minute!
 </div>
 
 In this section, you'll learn how to manage your Kong instance. First, we'll