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/listmonk-compose.yml.j2

@@ -23,11 +23,6 @@ services:
       LISTMONK_ADMIN_PASSWORD: {{ vault_listmonk.admin_password }}
     volumes:
       - uploads:/listmonk/uploads
-    labels:
-      glance.name: Listmonk
-      glance.url: https://{{ subdomains.listmonk }}/
-      glance.description: Mailing list manager
-      glance.id: listmonk
 
   db:
     image: postgres:17-alpine
@@ -44,9 +39,6 @@ services:
       retries: 6
     volumes:
       - listmonk-data:/var/lib/postgresql/data
-    labels:
-      glance.parent: listmonk
-      glance.name: DB
 
 volumes:
   uploads: