math is not rendered correctly in online docs

[Roland Haas]

The mathjax (so one hopes) rendered math in thorndocs eg in http://einsteintoolkit.org/thornguide/CactusNumerical/LocalReduce/documentation.html is not being shown correctly. I (firefox 102.5.0esr, Debian Linux/GNU) am shown:

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instead of the correct (when I run make LocalReduce-ThornDocHTML on my laptop):

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This most likely is due to different tex4html engines in Ubuntu 20.04 (the github documentation runner) and Debian bullseye.

[Roland Haas]

More examples exist in http://einsteintoolkit.org/thornguide/Scalar/ScalarEvolve/documentation.html and http://einsteintoolkit.org/thornguide/Scalar/TwoPunctures_BBHSF/documentation.html See eg https://bitbucket.org/einsteintoolkit/tickets/issues/2485/include-complex-and-real-scalar-evolution#comment-65663615