建议添加KaTeX对mhchem的支持

[Hades-001]

I want to create a new issue

• [x] Yes, I have read FAQ.
• [] Yes, I have read Hexo Docs page.
• [x] Yes, I have read Hexo-theme-stun Docs.
• [x] And yes, I already searched for current issues and this did not help me.

Stun Information

Stun Version: v4.2.1

Hexo Version: v2.1.1

Platform: Windows

Browser: Chrome

Expected behaviour

Actual behaviour

Steps to reproduce the behaviour

Feature Request

由于部分文章需要用到化学式，用mathjax渲染的话与Pjax不兼容，KaTeX（ https://github.com/KaTeX/KaTeX/tree/master/contrib/mhchem ）已经可以正常渲染化学式了，不知道是否可以添加KaTeX对mhchem的支持？

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[liuyib]

@Hades-001 这个可以，最近的版本会添加上，感谢建议💓