Lint / prettify MDX (including code blocks)

[trevor-scheer]

Paired with @trevorblades to update our eslint and prettier config to prettify code blocks.

Aside from noise, I think this change is fairly uncontroversial and @rkoron007 has expressed that she would find the DX offered here to be a major improvement on what she currently does for code block formatting.

TODO:

• Enforce at CI

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[trevor-scheer]

Comments are unfortunately the only thing blocking this PR. The parser breaks on HTML-style comments. JSX-style comments are acceptable by the parser, but turn up in the final HTML.

So, we either:

1. Figure a way to strip HTML comments before mdx parsing happens
2. Print JSX-style comments correctly (i.e. don't print them) when we generate the HTML

cc @trevorblades, any insight?

[glasser]

Removing myself from this old draft PR to stop the daily pings (I do think this is a good idea though if @trevorblades can help us with the comments).

[trevor-scheer]

Yeah, I think this one is worth leaving open, it's just blocked by apollographql/docs#249 which DX has said they intend to do eventually. A lot of the conflicts should resolve trivially since the file updates are all done by tooling.