Test docs against Lynx, also make docs print-friendly.

Use thinner weight for version number

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

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.

Implement Next.js MDX

Separate the docs from the code and tests.