remove: Docs (impress) and People (desk) from La Suite

Collabora stays (Drive needs it for WOPI document editing).
Removed: Helm charts, values, nginx configs, patches, OIDC clients,
Vault secrets, S3 buckets, Pingora routes, Kratos return URLs,
overlay image overrides and resource patches, local-up.sh restarts.

overlays/production/kustomization.yaml

@@ -39,11 +39,6 @@ images:
     newName: src.DOMAIN_SUFFIX/studio/meet-frontend
     newTag: latest
 
-  # people-frontend — built from source with estudio theme baked in.
-  - name: lasuite/people-frontend
-    newName: src.DOMAIN_SUFFIX/studio/people-frontend
-    newTag: latest
-
   # Messages — built from source and pushed to Gitea registry.
   - name: messages-backend
     newName: src.DOMAIN_SUFFIX/studio/messages-backend