Use Encode Sans variable axes from Google Fonts. Also specified code blocks and images to be grayscale in print mode.

Use Next.js router links instead of the ordinary `<a>` tags.

Include web fonts in loading.

Add syntax highlighting + improved props table.

Prepare requirements for Next to build the documentation.

Make sidebar toggleable on mobile.

Make docs use the latest (bleeding edge) of the components by importing them directly.

Use src/ for react-common source

TODO: put other package-related files in packages/react-common/

Implement Next.js MDX

Separate the docs from the code and tests.