Add KaTex server-side math rendering support

[joshlk]

Checklist

• I have read and accepted the contributing guidelines.

Is your feature request related to a problem? Please describe

Firstly, thank you for your hard work on Chirpy! I have a blog that contains posts with a lot of math equations, and I have had a great deal of trouble with the MathJax rendering: long load times, the math never rendering without a refresh, and some equations missing. For example this page.

Describe the solution you'd like

As most web browsers now directly support MathML, server-side rendering of math equations is a good option via KaTex, which converts the LaTeX equation to MathML when the pages are converted to HTML. This removes the need for MathJax and the use of JavaScript. For example jektex is a Jekyll plugin to do just that.

I have created a PR which implements this feature: #2603

Describe alternatives you've considered

No response

Additional context

No response

[joshlk]

Hi @cotes2020, I have created a PR #2603 which implements server side rendering of math equations to resolve the issues with MathJax. Is this something you would consider merging? Thanks for your work on the project! Josh