[FIX] Switch to the much lighter KaTeX library

[Avni2000]

MathJax libraries were taking too long to load via cdn, would be too complicated to prune, and still wouldn't be as light as KaTeX.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch migrate-to-katex

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