Update proxy-configuration.md - combined guide for WSS/proxy & docker…

[randomyn]

…-compose based

• docker compose based guide that combines reverse proxy & secure websockets steps and simplifies the setup process for new gw operators:
• getting rid of manual certbot / ACME certification setup steps (auto-managed by Traefik labels in compose file)
• docker compose allows for easy upgradeability of components or migration to a new server
• fewer config steps

---

This change is