Fiddle links in docs

docs/authorization-configuration.md

@@ -1,5 +1,7 @@
 # Authorization configuration
 
+>**NOTE:** For learning and testing purposes, use the [Luigi Fiddle](https://fiddle.luigi-project.io) page where you can configure a sample Luigi application.
+
 Luigi provides OpenID Connect and OAuth2 Implicit Grant authorization out of the box. The **use** key defines the active authorization provider and the **disableAutoLogin** key allows you to disable the automatic login flow that is provided by default.
 
 ````

docs/authorization-events.md

@@ -1,5 +1,7 @@
 # Authorization events
 
+>**NOTE:** For learning and testing purposes, use the [Luigi Fiddle](https://fiddle.luigi-project.io) page where you can configure a sample Luigi application.
+
 Luigi provides life cycle events which it can trigger internally or by authorization providers.
 Events are part of the **auth** configuration object and have to be functions. They can be executed asynchronously.
 

docs/communication.md

@@ -1,5 +1,7 @@
 # Communication
 
+>**NOTE:** For learning and testing purposes, use the [Luigi Fiddle](https://fiddle.luigi-project.io) page where you can configure a sample Luigi application.
+
 ## Custom messages
 
 Luigi Core and Luigi Client can exchange custom messages in both directions.

docs/general-settings.md

@@ -1,5 +1,7 @@
 # General settings
 
+>**NOTE:** For learning and testing purposes, use the [Luigi Fiddle](https://fiddle.luigi-project.io) page where you can configure a sample Luigi application.
+
 The configuration file contains a section called **Settings** in which you can configure additional Luigi options.
 
 ```javascript

docs/navigation-configuration.md

@@ -33,7 +33,9 @@ There are three main elements to Luigi:
 
 Go to the `basicConfiguration.js` file in your `luigi-config` folder. You can configure the navigation by editing this file. 
 
-The file consists of a tree-like structure of **navigation nodes**. The first level nodes represent the top navigation, while their children represent the side navigation. The nodes have some basic properties, such as labels, links, views, and (optionally) children. These properties are called **navigation parameters**.
+To experiment with navigation options, you can also use the [Luigi Fiddle](https://fiddle.luigi-project.io) page where you can configure a sample Luigi application.
+
+The configuration file consists of a tree-like structure of **navigation nodes**. The first level nodes represent the top navigation, while their children represent the side navigation. The nodes have some basic properties, such as labels, links, views, and (optionally) children. These properties are called **navigation parameters**.
 
 Here is an example of a simple navigation structure: