MathJax 3 and Xake

[bartsnapp]

It seems that an incompatibility of current definition of \answer AND \[ \] are blocking our deploy with a more recent version of TeXLive -- 2019 is OK, 2023 is not.

Perhaps these links will help:

https://tex.stackexchange.com/questions/565039/tex4ht-does-not-handle-ifdefined-hcode-in-mathjax-mode

https://tex.stackexchange.com/questions/620104/error-using-ifdefined-hcode-with-tex4ht-but-it-works-in-luatex?rq=1

https://tex.stackexchange.com/questions/638304/tex4ht-no-longer-process-some-math-what-is-the-cause?rq=1

At this point all issues but answer may be fixed....