mod_http_oauth2: Create proper template for OOB code delivery This also improves security by reusing the security and cache headers, where mod_http_errors/http-message doesn't add such headers. Colors selected by taking rotating the error colors, rrggbb -> ggbbrr

---
summary: Store authentication events in the audit log
rockspec:
  dependencies:
  - mod_audit
...

This module stores authentication failures and authentication successes in the
audit log provided by `mod_audit`.