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/handlers/main.yml

@@ -1,11 +1,4 @@
 # roles/docker/handlers/main.yml
-- name: restart glance
-  community.docker.docker_compose_v2:
-    project_src: /opt/stacks/glance
-    files:
-      - compose.yml
-    state: restarted
-
 - name: restart caddy
   community.docker.docker_compose_v2:
     project_src: /opt/stacks/caddy