doc: render math with HTML to make it selectable (fix haskell#8453) (h…

…askell#9361)

* doc: render math with HTML to make it selectable (fix haskell#8453)

* Update doc/conf.py

Co-authored-by: Bryan Richter <bryan@haskell.foundation>

---------

Co-authored-by: Bryan Richter <bryan@haskell.foundation>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

doc/conf.py

@@ -102,8 +102,8 @@
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'CabalUsersGuide'
 
-# MathJax to use SVG rendering by default
-mathjax_path = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-AMS-MML_SVG'
+# MathJax to use HTML rendering by default (makes the text selectable, see #8453)
+mathjax_path = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-AMS_CHTML'
 
 
 # -- Options for LaTeX output ---------------------------------------------