WebSocket Relay: P2P style communication without WebRTC

I finally published my first Docker image in Docker Hub! And it took a lot of prep, including updating documentation in the GitHub repo and ensuring everything works great.

> docker run -p 22002:22002 nicholashill/wsrelay:latest

WebSocket Relay Server facilitates P2P-style communication between different browser users, without any WebRTC faff. It acts as an intermediatory relaying messages between users and can support scenarios such as online chat or multiplayer gaming.

Some example applications:

1. PlayGrid (https://home.nick-hill.com/games/playgrid/) uses WSRelay Server. Try opening multiple tabs to see it in action!

2. For a very basic HTML-only demo, go here (https://home.nick-hill.com/static/wsrelay-demo.html) to explore a basic messaging application.