Full lab documentation and infrastructure as code

- Trino catalogs, Grafana, Spark jobs, LDAP LDIF, NPM compose
- Airflow DAG scripts, Proxmox VM inventory, network docs
- Ansible playbook, Gitea CI validate workflow
- Backup and health-check scripts, cron documentation
- Homepage DOCS tab with links to all documentation
- Extended collect-fleet-config.sh and populate-repo.py

config/homepage/settings.yaml

@@ -51,6 +51,10 @@ layout:
     tab: FEEDS
     style: row
     columns: 6
+  Documentation:
+    tab: DOCS
+    style: row
+    columns: 4
   News & Resources:
     tab: LINKS
     style: row