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Resolves #40
Rationale
Create React App is legacy software that has been unmaintained for years, and is deprecated by Meta. Vite has quickly become the new standard for standalone React apps like this. It provides modern, maintained, and widely-used tooling to replace Create React App.
This PR replaces CRA with Vite. It also fixes/replaces the testing harness (it was broken previously). These changes should be self-explanatory for the most part, but feel free to ask if anything isn't.
It also adds testing and building in CI. I would have added this as a separate PR, but testing was previously broken and setup is slightly different with this PR.