/classes should take advantage of fast-refresh.

[GuillermoFloresV]

Describe the bug
We currently are not taking advantage of refreshing our DOM when we create new classrooms and instead rely on reloading our page to see any changes in our UI. Making the data inside of our classes page rely on a state should help us solve that issue and remove the need to reload the page in order to see any new changes made to the UI.
To Reproduce
Steps to reproduce the behavior:

1. Go to /classes
2. Create, delete, or edit a classroom
3. Page must reload to see any changes to the DOM

Expected behavior
The DOM should refresh to show the new state of the ClassInviteTable component.

Additional context
Currently being worked on in #357

[lloydchang]

@Komal914 See above.