fix(html-template)!: load header-includes before math for MathJax config #7833
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MathJax expect the config comes before loading the MathJax script.
This change of order allows one to config MathJax via header-includes,
which loads before the MathJax script.
This potentially is a breaking change.
However, the only other kind of math supported by pandoc that is configurable
seems to be katex, and according to
src/Text/Pandoc/Writers/HTML.hs
the way it is configured is hard-coded (katex doesn't seem to offer
MathJax style config that is independent of loading MathJax.)
So it seems it is safe to change this order without breaking
others' documents.
c.f. #2750
Edit: see https://docs.mathjax.org/en/latest/web/configuration.html#configuration-using-an-in-line-script
for the doc to config MathJax.