Add devigo deployment role for mini-vps production environment

- Created comprehensive devigo Ansible role with Podman Quadlet support
- Deployed devigo-site container (Hugo + nginx) via systemd
- Deployed devigo-decap-oauth OAuth2 proxy for Decap CMS
- Integrated with Caddy reverse proxy for HTTPS

Services deployed:
- devigo.no (apex domain, primary)
- www.devigo.no (redirects to apex)
- decap.jnss.me (OAuth proxy)

Key features:
- REGISTRY_AUTH_FILE environment for Podman GHCR authentication
- TRUSTED_ORIGINS (plural) for decapcms-oauth2 multi-origin support
- JavaScript-based Decap CMS initialization (eliminates YAML MIME dependency)
- nginx location block for YAML MIME type (text/yaml)
- Automated deployment via GitHub Actions CI/CD
- Comprehensive documentation with troubleshooting guide
- Architecture decision records

Fixes applied during deployment:
- OAuth origin trust validation (TRUSTED_ORIGINS vs TRUSTED_ORIGIN)
- MIME type handling strategy (location-specific vs server-level types block)
- Decap CMS initialization method (JavaScript vs link tag)
- Podman authentication for systemd services (REGISTRY_AUTH_FILE)

Testing status:
- ✅ MIME types verified (HTML, CSS, YAML all correct)
- ✅ OAuth authentication working
- ✅ Container image pulls from private GHCR
- ✅ Automated deployments functional
- ✅ Site fully operational at devigo.no

roles/devigo/templates/devigo-site.container

@@ -0,0 +1,31 @@
+[Unit]
+Description=Devigo Website - Sales Training Company
+After=network-online.target caddy.service
+Wants=network-online.target
+Requires=caddy.service
+
+[Container]
+Image=ghcr.io/jnschaffer/rustan:prod
+ContainerName=devigo-site
+AutoUpdate=registry
+Pull=newer
+
+# Port mapping - publish to localhost only
+PublishPort=127.0.0.1:9080:80
+
+# Security
+NoNewPrivileges=true
+
+# Health check - check if nginx is responding
+HealthCmd=/usr/bin/curl -f http://localhost:80/ || exit 1
+HealthInterval=30s
+HealthTimeout=10s
+HealthRetries=3
+
+[Service]
+Environment=REGISTRY_AUTH_FILE=/etc/containers/auth.json
+Restart=always
+TimeoutStartSec=900
+
+[Install]
+WantedBy=default.target