feat(docs): editable examples

[levithomason]

Done

• show JSX and HTML on load for direct anchor links
• allow editing JSX
• show errors
• update rendered HTML with rendered component
• debounce errors/render for better performance
• transform import/export statements to work in the browser

TODO

• Icon examples relied on props being passed through the component example. That no longer works. Fix icon examples.

[codecov-io]

Current coverage is 99.49% (diff: 100%)

Merging #566 into master will not change coverage

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