move url reader docs to plugins -> backend apis

Signed-off-by: Himanshu Mishra <himanshu@orkohunter.net>

mkdocs.yml

@@ -98,7 +98,6 @@ nav:
           - Locations: 'integrations/google-cloud-storage/locations.md'
       - LDAP:
           - Org Data: 'integrations/ldap/org.md'
-      - URL Reader: 'integrations/url-reader.md'
   - Plugins:
       - Intro to plugins: 'plugins/index.md'
       - Existing plugins: 'plugins/existing-plugins.md'
@@ -113,6 +112,7 @@ nav:
           - Backend plugin: 'plugins/backend-plugin.md'
           - Call existing API: 'plugins/call-existing-api.md'
           - GitHub Apps for Backend Authentication: 'plugins/github-apps.md'
+          - URL Reader: 'plugins/url-reader.md'
       - Testing:
           - Testing with Jest: 'plugins/testing.md'
       - Publishing: