* Include HAProxy example in reverse proxy guide
Added HAProxy configuration example for reverse proxy setup.
* Revise HAProxy config and add OPNSense guide
Updated HAProxy configuration details and added a guide for OPNSense HAProxy add-on setup.
* Revise HAProxy configuration steps in guide
Updated the step-by-step guide for configuring HAProxy on OPNSense, ensuring clarity and consistency in instructions.
* Update note on port 443 request forwarding
Clarified note about forwarding requests on port 443 and provided guidance on creating rules and conditions for multiple websites.
* Fix proxy mode description and bind command typo
Corrected the proxy mode description from Layer 7 to Layer 4 and fixed a typo in the bind command.
* Clarify Layer 4 proxy configuration details
Added note about changing hdr(host) to req.ssl_sni for TCP traffic.
