Add "update browser cache" flag to frontend

[SteveMicroNova]

Some larger changes to the backend will cause the frontend to have very odd behavior if that isn't updated alongside it, but due to how browsers work there can be a stale version of the frontend code being used by someone for weeks at a time. Find a way to add a flag that we can toggle that says something along the lines of "if cache is older than {insert update release date here}, update your cache" to the frontend

[SteveMicroNova]

Solved in #1062 by adding caching rules to the uvicorn server