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/cron/files/update_warhammer_feed.sh

@@ -10,6 +10,3 @@ docker run --rm -v "$TMP_DIR":/app/output git.thesatelliteoflove.com/phil/rss-wa
 
 # Copy the generated file to the desired location
 cp "$TMP_DIR/warhammer_rss_feed.xml" /opt/stacks/caddy/site/tsol/feeds
-
-# Restart the Docker stack
-docker compose -f /opt/stacks/glance/compose.yml restart