Proxy should support configuring redirects

[GyulyVGC]

nullnet-proxy can be configurable to support URL redirects.

Note

This was requested by Kevin:
The app could support routing similar to NGINX's location block.
This would allow routing requests based on URL paths (e.g., /api, /grafana, /gitlab) to different backend services without requiring a separate NGINX instance.
It would make managing multiple web applications much simpler.
Redirections of course that's included