KaTeX: don't use autorenderer.

We no longer surround formulas with `\(..\)` or `\[..\]` and
rely on the autorenderer. Instead, we tell katex to convert
the contents of span elements with class "math". Since math has
already been identified, this avoids wasted time parsing
for LaTeX delimiters.

Note, however, that this may yield unexpected results
if you have span elements with class "math" that
don't contain LaTeX math.

Also, use latest version of KaTeX by default (0.9.0).

Closes #4946.

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