Refactor the codebase into React

[jwin-mm]

Current Problems

1. The codebase is roughly 9 years-old and uses out-dated libraries and logic.
2. All of the code is written in just 2 "big" files.
3. This makes identifying pain-points, update locations, and update logic difficult, although major overhauls are unlikely.

Proposed solutions

1. Update the codebase to using React to introduce code and component modularity.
2. Split the 2 "big" files into multiple smaller files to untwine different logic.