spectacle-mdx-loader: MDX component map lacks a lot of things that Markdown supports

[ryan-roemer]

We have a discrepancy in code blocks in MD vs. MDX and likely other Spectacle core component support.

Example

For our MD example with pnpm start:md for the code page we have:

For our MDX example with pnpm start:mdx for the code page with exact same sample we have:

Cause

Our Markdown component and related components do a lot more things than our mdxComponentMap does that we pass into MDX.

Work

See if we can expand mdxComponentMap to something more general that ideally doesn't rejigger core Spectacle too much.