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/manyfold-compose.yml.j2

@@ -26,10 +26,6 @@ services:
     extra_hosts:
       - "{{ subdomains.pocketid }}:{{ docker.hairpin_ip }}"
     labels:
-      glance.name: Manyfold
-      glance.icon: si:open3d
-      glance.url: https://{{ subdomains.models }}/
-      glance.description: STL Storage
       mag37.dockcheck.update: true
     restart: unless-stopped
     # Optional, but recommended for better security