Remove existing GA 'integration' docs.

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>

docs/integrations/google-analytics/installation.md

@@ -1,23 +0,0 @@
----
-id: installation
-title: Google Analytics Installation
-sidebar_label: Installation
-# prettier-ignore
-description: Adding Google Analytics to Your App
----
-
-There is a basic
-[Google Analytics](https://marketingplatform.google.com/about/analytics/)
-integration built into Backstage. You can enable it by adding the following to
-your app configuration:
-
-```yaml
-app:
-  googleAnalyticsTrackingId: UA-000000-0
-```
-
-Replace the tracking ID with the one generated for you after signing up for the
-Google Analytics service.
-
-The default behavior is only to send a pageview hit. To record more, review the
-[Google Analytics developer documentation](https://developers.google.com/analytics/devguides/collection/gtagjs).

microsite/sidebars.json

@@ -146,11 +146,6 @@
         "label": "GitLab",
         "ids": ["integrations/gitlab/locations"]
       },
-      {
-        "type": "subcategory",
-        "label": "Google Analytics",
-        "ids": ["integrations/google-analytics/installation"]
-      },
       {
         "type": "subcategory",
         "label": "Google GCS",

mkdocs.yml

@@ -97,8 +97,6 @@ nav:
           - Org Data: 'integrations/github/org.md'
       - GitLab:
           - Locations: 'integrations/gitlab/locations.md'
-      - Google Analytics:
-          - Installation: 'integrations/google-analytics/installation.md'
       - Google GCS:
           - Locations: 'integrations/google-cloud-storage/locations.md'
       - LDAP: