#726, #969: Add mathjax_config

[tk0miya]

Feature or Bugfix

• Feature

Purpose

• see Add support for LaTeX preambles to the MathJax extension #726, Allow MathJax customization via local.js #969

[codecov]

Codecov Report

Merging #5230 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #5230      +/-   ##
=========================================
+ Coverage   82.29%   82.3%   +<.01%     
=========================================
  Files         300     300              
  Lines       39535   39548      +13     
  Branches     6074    6077       +3     
=========================================
+ Hits        32536   32550      +14     
  Misses       5667    5667              
+ Partials     1332    1331       -1

Impacted Files	Coverage Δ
sphinx/ext/mathjax.py	90.47% <100%> (+0.82%)	⬆️
tests/test_ext_math.py	83.33% <100%> (+0.6%)	⬆️
sphinx/builders/html.py	82.88% <100%> (+0.16%)	⬆️

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