theme: Render mathematical markup with transform.ToMath

Closes #2897

content/en/content-management/mathematics.md

@@ -230,6 +230,8 @@ To use KaTeX instead of MathJax, replace the partial template from [Step 2] with
 
 The delimiters above must match the delimiters in your site configuration.
 
+<!--
+
 ## Chemistry
 
 Both MathJax and KaTeX provide support for chemical equations. For example:
@@ -242,6 +244,8 @@ $$C_p[\ce{H2O(l)}] = \pu{75.3 J // mol K}$$
 
 As shown in [Step 2] above, MathJax supports chemical equations without additional configuration. To add chemistry support to KaTeX, enable the mhchem extension as described in the KaTeX [documentation](https://katex.org/docs/libs).
 
+-->
+
 [KaTeX]: https://katex.org/
 [LaTeX]: https://www.latex-project.org/
 [MathJax]: https://www.mathjax.org/