separated new cursor events

added toast notifications for entering & leaving editors

added username input form prior to joining doc

hot fix for socket disconnection

finish multi-user cursor highlighting

merged from main

adding multi-user text highlighting

added dockerfile

added invalid ID handling server-side

fixed docker compose

added docker-compose + starting error handling client side

formatting whoops

readme update

implemented DB + cache w/ automatic saving - finished for now

individual docs work + starting DB integration