TechDocs: Use URL Reader in the out-of-the-box experience

It is time to start using URL Reader for the exmaple docs components we provide in the out-of-the-box experience (i.e. when users experience TechDocs by doing a git clone of this repository).

URL Reader makes the prepare step 8x faster.

app-config.yaml

@@ -178,9 +178,9 @@ catalog:
     # Example component for github-actions
     - type: url
       target: https://github.com/backstage/backstage/blob/master/plugins/github-actions/examples/sample.yaml
-    # Example component for techdocs
+    # Example component for TechDocs
     - type: url
-      target: https://github.com/backstage/backstage/blob/master/plugins/techdocs-backend/examples/documented-component/documented-component.yaml
+      target: https://github.com/backstage/backstage/blob/master/plugins/techdocs-backend/examples/documented-component/catalog-info.yaml
     # Backstage example APIs
     - type: url
       target: https://github.com/backstage/backstage/blob/master/packages/catalog-model/examples/all-apis.yaml

catalog-info.yaml

@@ -6,7 +6,7 @@ metadata:
     Backstage is an open-source developer portal that puts the developer experience first.
   annotations:
     github.com/project-slug: backstage/backstage
-    backstage.io/techdocs-ref: github:https://github.com/backstage/backstage.git
+    backstage.io/techdocs-ref: url:https://github.com/backstage/backstage/tree/master
     lighthouse.com/website-url: https://backstage.io
 spec:
   type: library

plugins/techdocs-backend/examples/documented-component/catalog-info.yaml

@@ -4,7 +4,7 @@ metadata:
   name: documented-component
   description: A Service with TechDocs documentation
   annotations:
-    backstage.io/techdocs-ref: 'github:https://github.com/backstage/backstage/blob/master/plugins/techdocs-backend/examples/documented-component'
+    backstage.io/techdocs-ref: 'url:https://github.com/backstage/backstage/tree/master/plugins/techdocs-backend/examples/documented-component'
 spec:
   type: service
   lifecycle: experimental