[AB-473] Improve formatting and code in react app

We should perform the following additional changes:

Break each component up into a separate file
If it makes sense, combine some components together - there are some very small components
Switch from using jquery .ajax to fetch() to make queries (check if we need a polyfill)
Remove uses of ts-ignore, any, and ! and replace with proper types
change from using string constants to enums
Set up react router so that each page has a proper URL, and set it up in flask as well
Properly cancel fetch events when unloading a component (especially class view)
reuse code between class-viewer and editor

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