Let the user choose Katex or Mathjax

[mathwo]

Prerequisites

• I have searched for duplicate or closed feature requests
• I am mindful of the project scope

Proposal

Right now I cannot find options in config to choose using Katex or Mathjax to render the math blocks. And by default it is Katex. Katex cannot render some commands that are only available in Mathjax.

The solution is, please provide an option in config file so user can choose.

Motivation and context

There are quite some situations that we need Mathjax contents to be rendered on blog.

[github-actions]

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