🧙 Render new nodetypes for Sphinx autodoc

[agoose77]

This PR adds some basic styling for mdast nodes emitted by https://github.com/executablebooks/sphinx-ext-mystmd

[rowanc1]

As these are specific for sphinx, are not used in scientific , and the AST might change. I think these should be their own package. Ideally we have them as an export out of myst-ext-autodoc/react?

Doing that makes it a bit harder to do the auto reload, but I think it is maybe worth it?

If we did that, then I still think these should come in by default in the themes we have, but other themes can make different choices.

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[rowanc1]

In conversation today: we should see how far we can get on doing a pre-transform on the AST to use kind to differentiate, e.g., a field list, on a definitionList.

[agoose77]

Closed in favour of #443