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.

Display prop table in each component's props section

Peer dependency required for components with icons.

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.