chore: clean up extended components

[crookse]

Summary

What:

The extended components we pass to react-markdown have a bunch of code that's starting to get confusing. I wrote it and even I'm confused. Need to rewrite these components so that they're not so huge and look more declarative for readability.

Why:

Prevent a maintenance nightmare.

Acceptance Criteria

Below is a list of tasks that must be completed before this issue can be closed.

• Write unit tests (need to ensure that the current behavior works as it does after the refactor)