Refactor docker-compose build logic and pull policy

- Added conditional '--pull' flag on retry in docker-compose build handler, tied to MODE_UPDATE
- Added 'pull_policy: never' to multiple docker-compose service templates to prevent unwanted image pulls
- Fixed minor formatting issues (e.g. Nextcloud volume spacing, WordPress desktop alignment)

Reference: https://chatgpt.com/share/68b0207a-4d9c-800f-b76f-9515885e5183

roles/web-app-wordpress/config/main.yml

@@ -10,7 +10,7 @@ plugins:
 features:
   matomo:             true
   css:                false
-  desktop:    true
+  desktop:            true
   oidc:               true
   central_database:   true
   logout:             true