Update socket connection

This release updates mainly the socket connection (cleint and server)
The server has been completely revised and now efficiently manages temporary user data. (https://github.com/ph1p/figma-chat-server)
Some unused lines of code have been removed.
The build is now with webpack 5!

Commits

refactor: remove unused main variable (bc31cc0)
refactor: update dependencies and tidy up the socket connection a little bit (3bd38fd)
refactor(mobx): move to new mobx 6 and update build process (d00e677)
build: remove unused packages and downgrade terser (5baf2cb)