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[Ethsim2 (Ethan)]

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Upgrading Mathjax to version 4

@sam and all interested in typing math in Discourse. I’ve updated the discourse-math plugin so that it uses MathJax V3, rather than the much slower and very outdated V2. As expected, the result is a much snappier user experience, while still maintaining the feature rich environment as compared to KaTeX. I’d love to issue a pull request, if you think the results look good. You can see it in action on my class Discourse site: Most of the content on that site is private or unlisted. There sho…