Switch from KaTeX to imgmath for documentation rendering. #23025
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Stack from ghstack:
Emprically, KaTeX is bad user experience for users who don't have
powerful CPUs. With x4 CPU slowdown emulation in Chrome, I notice
that imgmath takes a third of the time to render than KaTeX.
This requires pytorch/pytorch_sphinx_theme#48 to
be landed first, as otherwise the style sheet renders img incorrectly.
Might be one step on the way to solving #20984.
Signed-off-by: Edward Z. Yang ezyang@fb.com
Differential Revision: D16441000