- Added global DNS nameservers configuration for headscale
- Included Cloudflare DNS servers (1.1.1.1, 1.0.0.1) and IPv6 addresses
- Added local DNS server (192.168.178.254) for internal resolution
- Added extra HTTP headers and security configurations in the Nginx proxy for Headscale.
- Improves websocket handling, security headers, and HTTPS redirection.
- Introduced OIDC settings in Headscale, including allowed domains, client ID, client secret path, and issuer.
- Enables support for OpenID Connect authentication.
- Included `headscale.nix` in the MX system configuration for VPN management.
- Added Nginx and ACME configuration to route traffic securely to Headscale.
- Ensures Headscale is enabled with required settings and packaged in the system.
