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/cronmaster-compose.yml.j2

@@ -19,12 +19,6 @@ services:
       - /opt/stacks/cronmaster/data:/app/data
       - /opt/stacks/cronmaster/snippets:/app/snippets
     labels:
-      glance.url: "http://{{ network.docker_host_ip }}:40123/"
-      glance.title: CronMaster
-      glance.description: Cron job management interface
-      glance.group: Infrastructure
-      glance.parent: infrastructure
-      glance.name: CronMaster
       mag37.dockcheck.update: true
 networks:
   default: