Organize catalog examples into sub-directories, cleanup (#2963)

A later commit is going to add an "example" organization of users and
groups. Re-organizing this upfront, is going to make the follow up
commits a little tidier.

packages/catalog-model/examples/all-apis.yaml

@@ -6,7 +6,7 @@ metadata:
 spec:
   type: github
   targets:
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/hello-world-api.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/streetlights-api.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/spotify-api.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/swapi-graphql.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/apis/hello-world-api.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/apis/streetlights-api.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/apis/spotify-api.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/apis/swapi-graphql.yaml

packages/catalog-model/examples/all-components.yaml

@@ -6,11 +6,11 @@ metadata:
 spec:
   type: github
   targets:
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/artist-lookup-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/playback-order-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/podcast-api-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/queue-proxy-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/searcher-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/playback-lib-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/www-artist-component.yaml
-    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/shuffle-api-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/artist-lookup-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/playback-order-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/podcast-api-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/queue-proxy-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/searcher-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/playback-lib-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/www-artist-component.yaml
+    - https://github.com/spotify/backstage/blob/master/packages/catalog-model/examples/components/shuffle-api-component.yaml