add fortwayne-proxmox configuration for SSL and proxy settings

[runleveldev]

This pull request adds a new Nginx reverse proxy configuration for the fortwayne-proxmox.opensource.mieweb.org server. The configuration enables secure HTTPS access with modern TLS settings, HTTP/2 and HTTP/3 support, and optimized proxying to a backend Proxmox server. The most important changes are:

New Reverse Proxy Configuration:

• Added a new server block in fortwayne-proxmox.conf to handle HTTPS, HTTP/2, and HTTP/3 traffic for fortwayne-proxmox.opensource.mieweb.org, proxying requests to the internal Proxmox server at 10.250.0.2:8006.

Security and Performance Enhancements:

• Configured SSL with modern protocols (TLSv1.2, TLSv1.3), strong ciphers, OCSP stapling, and security headers such as HSTS, X-Frame-Options, and X-Content-Type-Options.
• Enabled HTTP/2 and HTTP/3 (QUIC) support for improved performance and compatibility.

Proxy and WebSocket Support:

• Set up proxy headers for correct forwarding of client information and enabled WebSocket support by handling Upgrade and Connection headers.
• Increased client_max_body_size to 100MB to support large uploads,

[cmyers-mieweb]

LGTM