Client: Chunk admin tools

[TiE23]

Use code chunking to reduce the bundle size for student accounts.

Chunking away the admin tools first I believe would be a great start as they are easily avoidable.

User/Question/Feedback pages.
Question editor/creator page.

Using import promises and create-react-app build functionality:
https://www.youtube.com/watch?v=ejSxCMPWZ84
A bit simple and specific, would require modifying many files

Using WebPack and getComponent prop in routes:
https://www.youtube.com/watch?v=hurp86gBtI0
Seems a little confusing, and I'm not sure it'd be easy to do without ejecting the project first.

Using React v16.6 Lazy Load:
https://www.youtube.com/watch?v=tV9gvls8IP8
https://itnext.io/async-react-using-react-router-suspense-a86ade1176dc
https://reactjs.org/docs/code-splitting.html#route-based-code-splitting
This definitely seems the best, modify the routes instead, but does require an upgrade to React v16.6.