Remove the unused Glance dashboard

Drop the Glance stack, its home. route and DNS record, the glance.*
labels on every container, and the Glance restart in the Warhammer
feed cron script. Update docs to match.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/docker/templates/gotosocial-compose.yml.j2

@@ -32,18 +32,11 @@ services:
     restart: "always"
     labels:
       docker-volume-backup.stop-during-backup: true
-      glance.name: GoToSocial
-      glance.icon: si:mastodon
-      glance.url: https://{{ subdomains.social }}/
-      glance.description: Fediverse server
-      glance.id: gotosocial
     
   backup:
     image: offen/docker-volume-backup:v2
     restart: always
     labels:
-      glance.parent: gotosocial
-      glance.name: Backup
       mag37.dockcheck.update: true
     environment:
       BACKUP_FILENAME: gts-backup-%Y-%m-%dT%H-%M-%S.tar.gz