Commit Katex

[Akemyakemy]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the [CONTRIBUTING](https://github.com/CuteLeaf/Firefly/blob/master/CONTRIBUTING.md) document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Related Issue

no related issues

Changes

Enable KaTeX mathematical formula rendering in the comment section.

Before

After

How To Test

1. Assure your comment-system-type is not “none”
2. Comment with a KaTeX mathematical formula such as “$$c = \pm\sqrt{a^2 + b^2}$$”
3. If you want to cancel the effect， you can Annotate/Delete my adding code to test.

Screenshots (if applicable)

As above.

Additional Notes

This function may help some bloggers discuss math problems with others.

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