discussion: Add some example docs for docusaurus

[anajavi]

This PR is just for discussion purposes in order to have directory structure and conventions for the component docs.

I just quickly added some component docs just to see how the structure feels to use.

I did not see need for separate docs and api, so I just squashed them together.

[codecov-io]

Codecov Report

Merging #241 into docusaurus will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           docusaurus     #241   +/-   ##
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  Coverage       90.55%   90.55%           
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  Files              70       70           
  Lines             889      889           
  Branches          168      168           
===========================================
  Hits              805      805           
  Misses             71       71           
  Partials           13       13

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[anajavi]

Found something interesting, which is included in the coming docusaurus v2.

React components can be embedded in page using MDX. That would be really helpful when writing component api docs. No need to embed stackblitz examples then.

[whawker]

Docs structure looks good, although I wonder if we should completely split the 3 variants to avoid confusion and keep things concise?

That MDX stuff looks cool - I saw the docusaurus v2 note, but didn't thing to check it out. It looks pretty close, I'm think we should skip v1 entirely to avoid future work.

[anajavi]

The work-in-progress react-leaflet docusaurus site includes live editor: https://react-leaflet-v3.now.sh