elevate app.packages to no longer be experimental

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/api-docs/README-alpha.md

@@ -68,9 +68,8 @@ To link that a component provides or consumes an API, see the [`providesApis`](h
    ```yaml
    # app-config.yaml
    app:
-     experimental:
-       # Auto discovering all plugins extensions
-       packages: all
+     # Auto discovering all plugins extensions
+     packages: all
      extensions:
        # Enabling some entity cards
        # The cards will be displayed in the same order it appears in this setting list

plugins/catalog-graph/README-alpha.md

@@ -36,18 +36,18 @@ This plugin installation requires the following steps:
 1. Add the `@backstage/catalog-graph` dependency to your app `package.json` file and install it;
 2. In your application's configuration file, enable the catalog entity relations graphic card extension so that the card begins to be presented on the catalog entity page:
 
-```yaml
-# app-config.yaml
-app:
-  experimental:
-    # Auto discovering all plugins extensions
-    packages: all
-  extensions:
-    # This is required because the card is not enable by default once you install the plugin
-    - entity-card:catalog-graph/relations
-```
+   ```yaml
+   # app-config.yaml
+   app:
+     # Auto discovering all plugins extensions
+     packages: all
+     extensions:
+       # This is required because the card is not enable by default once you install the plugin
+       - entity-card:catalog-graph/relations
+   ```
 
 3. Then start the app, navigate to an entity's page and see the Relations graph there;
+
 4. By clicking on the "View Graph" card action, you will be redirected to the catalog entity relations page.
 
 ## Customization
@@ -64,11 +64,10 @@ _Enabling auto discovering the plugin extensions in production_
 # app-config.production.yaml
 # Overriding configurations for the local production environment
 app:
-  experimental:
-    packages:
-      # Only the following packages will be included
-      include:
-        - '@backstage/plugin-catalog-graph'
+  packages:
+    # Only the following packages will be included
+    include:
+      - '@backstage/plugin-catalog-graph'
 ```
 
 _Disabling auto discovering the plugin extensions in development_
@@ -77,11 +76,10 @@ _Disabling auto discovering the plugin extensions in development_
 # app-config.local.yaml
 # Overriding configurations for the local development environment
 app:
-  experimental:
-    packages:
-      # All but the following package will be included
-      exclude:
-        - '@backstage/plugin-catalog-graph'
+  packages:
+    # All but the following package will be included
+    exclude:
+      - '@backstage/plugin-catalog-graph'
 ```
 
 For more options of package configurations, see [this](https://backstage.io/docs/frontend-system/architecture/app/#feature-discovery) documentation.

plugins/org/README-alpha.md

@@ -48,9 +48,8 @@ And below is an example of how a user page looks with the user profile and owner
    ```yaml
    # app-config.yaml
    app:
-     experimental:
-       # Auto discovering all plugins extensions
-       packages: all
+     # Auto discovering all plugins extensions
+     packages: all
      extensions:
        # Enabling the org plugin cards
        - entity-card:org/group-profile