npm / cli / #1283

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docs: validate that the docs can be parsed by mdx

Although our documentation is rendered for the "in the box" docs by
cmark-gfm, the upstream docs site (docs.npmjs.com) uses mdx, which is
a much stricter parser.  Update our docs generator site to ensure that
mdx can parse our documentation as well, to ensure that we get fast
feedback when it would fail.

PR-URL: https://github.com/npm/cli/pull/2711
Credit: @ethomson
Close: #2711
Reviewed-by: @darcyclarke

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