ci: QA suite (repo+live), Gitea Actions workflow, app config-as-code

- qa/site-qa.sh: repo structure/link checks + full live crawl (routes,
  links, assets, canonical-https)
- .gitea/workflows/qa.yml: repo QA on push, nightly live QA
- app/: config-as-code for the deployed sync job, scheduler entry,
  and Grav system.yaml (reverse-proxy HTTPS detection)
- local pre-push hook runs repo QA

https://projects.knownelement.com/issues/928

app/system.yaml

@@ -0,0 +1,14 @@
+site:
+  title: 'Rogue Technologies'
+  description: 'Fabrication, printing, and maker services in San Antonio, TX.'
+author:
+  name: 'VpEngOps'
+  email: 'tsgstaff-coo-vpengops@turnsys.com'
+reverse_proxy_setup: true
+http_x_forwarded:
+  protocol: true
+  host: true
+debugger:
+  enabled: false
+errors:
+  display: false