KaTeX (Math) Formulas

If you have KaTeX installed and available on your path, mkbook will try to render any code blocks with a language tag of katex as inline math blocks.

For example:

```katex
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
```

is rendered as:

x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

This feature is still experimental, but I find it handy for my books.

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