Add KaTeX server side math rendering support

[awwong1]

Addresses #6544

To enable, set in config.toml:

[markup]
  [markup.goldmark]
    [markup.goldmark.extensions]
      katex = true

Renders inline math $1+2=3$ as well as display math $$ \dfrac{1}{2} = 0.5 $$.

[claassistantio]

)
All committers have signed the CLA.

[awwong1]

Closing the PR due to no cgo rule.

[entron]

@awwong1 This would be great. What can't someone merge this?

[awwong1]

@entron I can empathize with the maintainers for not wanting to support a complicated cgo dependency for this feature. I know that this approach does break the build in certain environments. As an aside, because server side rendered math is important to me, I migrated over to Hexo. https://hexo.io/ https://github.com/hexojs/hexo-math

…

On Wed., Apr. 7, 2021, 3:31 a.m. Cheng Guo, ***@***.***> wrote: @awwong1 <https://github.com/awwong1> This would be great. What can't someone merge this? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#6842 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAVB3LZOTD346IPBWXGG7T3THQQ6FANCNFSM4KORHJVQ> .

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.