Add custom error pages and Nginx configuration for proxy module

- Introduced custom HTML error pages for various HTTP status codes (400, 401, 403, 404, 408, 429, 500, 502, 503, 504) in the proxy module.
- Created a .gitignore file to exclude non-HTML files in the error resources directory.
- Updated Nginx configuration to serve custom error pages for upstream errors.
- Added new Nginx configuration templates for handling HTTP and stream protocols.
- Implemented Wireguard configuration templates and associated variables for secure connections.
- Established Kubernetes resources for Stunnel and Wireguard, including deployment, service accounts, and config maps.
- Defined variables for the Stunnel and Wireguard modules to facilitate configuration.
- Created a new Wol Proxy module with Kubernetes resources for deployment and service management.

terraform/modules/utils/proxy/resources/wireguard/wireguard.conf.tpl

@@ -0,0 +1,10 @@
+[Interface]
+PrivateKey = ${wireguard_private_key}
+Address = ${wireguard_address}
+
+[Peer]
+PublicKey = ${wireguard_public_key}
+PresharedKey = ${wireguard_pre_shared_key}
+AllowedIPs = ${wireguard_allowed_ips}
+Endpoint = ${wireguard_endpoint}
+PersistentKeepalive = 25