Addon-docs: MDX Linking

[patricklafrance]

Issue: #8184

What I did

Improved MDX linking:

• It's now possible to link to an in page anchor.
• URL to other stories are now automatically transformed to use the top level iframe url instead of the preview iframe url.
• It's now possible to link to an anchor of another story
• Calling a story with a hash will scroll to the matching element.
• Github style autolink headers are automatically generated
• target and rel attributes is automatically added to all external links (view remark-external-link plugin for more info)

How to test

• Is this testable with Jest or Chromatic screenshots? No
• Does this need a new example in the kitchen sink apps? Already done
• Does this need an update to the documentation? Maybe?

It can be tested with the ?path=/docs/addons-docs-markdown-docs--page story of the official storybook.

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[shilman]

@patricklafrance this is INCREDIBLE! 💯💯💯

One small request is to fix the linking behavior. Storybook vs Github:

[patricklafrance]

@shilman done!

[shilman]

THIS IS SO RAD

[fooontic]

Is there any setting for this feature? Where can I find the sample code snippet of this feature? My Headings don't have ids, and I cant find how to fix it. Thanks

[lararosekelley]

Perhaps I'm missing something, but this doesn't appear to work as expected in the official docs - https://next--storybookjs.netlify.app/official-storybook/?path=/docs/addons-docs-markdown-docs--page

Clicking a heading just takes me to a blank page because it tries to go to the root path

[sag1v]

Perhaps I'm missing something, but this doesn't appear to work as expected in the official docs - https://next--storybookjs.netlify.app/official-storybook/?path=/docs/addons-docs-markdown-docs--page

Clicking a heading just takes me to a blank page because it tries to go to the root path

there's an open issue with a PR #16918