Update math-blocks.mdx with Gastby implementation.

[jackpeplinski]

See Gatsby issues:

• [gatsby-remark-katex] Doesn’t work with gatsby-plugin-mdx gatsbyjs/gatsby#21866
• gatsby-remark-katex doesn't work gatsbyjs/gatsby#6648

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[ChristianMurphy]

Thanks @jackpeplinski!
I've added some comments below.
I'm also not sure if this is where this documentation should live, both gatsby-plugin-mdx and gatsby-remark-katex are part of the Gatsby project rather than MDX, it may be worth considering documenting this on the Gatsby side. Thoughts @mdx-js/maintainers?

[jackpeplinski]

@ChristianMurphy That's a good point.

I only thought to include this edit because there was a NextJS implementation example.

[johno]

Yeah I think we can merge so it's colocated with the other related documentation, but maybe we can also link out to where it lives in the Gatsby docs, too?

[johno]

Also, thank you @jackpeplinski!