Issue on page /ipynb/SchrodingerEq.html about introqm HOT 5 CLOSED

@PaulWAyers Should work now. We'd already used MathJax3, the problem was with automatic reusing file from the _build folder. Deleting the folder and building book again helped:

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Thanks @kirstenentz ! I fixed it and it will change in the next build of the web site.

The issue seems to be that the way that the "color" keyword worked has changed. I'm sure it's going to show up more places in the notes too.....
https://docs.mathjax.org/en/latest/input/tex/extensions/color.html

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@RichRick1 can you figure out what is wrong? It looks OK in the Notebook but not on the web site.
https://github.com/QC-Edu/IntroQM2022/blob/master/ipynb/SchrodingerEq.ipynb
Is the Web Site served using MathJax or KaTex (or actual Latex). That could be the issue.

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Actually, I think that's the problem. MathJax 2 vs. 3. Can you upgrade to MathJax 3. We'll need that for bra-ket notation too.
https://jupyterbook.org/content/math.html
https://docs.mathjax.org/en/latest/input/tex/extensions/braket.html

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@PaulWAyers I'm working on it rn

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