refactor frontend, remove effect, clean up logic

[cs01]

Summary of changes

• Break app into smaller pieces/files
• Clean up logic in react app by replacing calls to useEffect with regular functions. Instead of reacting to changes in variables, explicitly make calls to create the websocket connection when ready. This removes a lot of the "magic" from the way the code was behaving.
• Upgrade npm packages with yarn upgrade

Test plan

Tested by running

make build_frontend
nox -s serve
nox -s broadcast