Apply theming to storybook.

Add stories for components inside fieldsets.

Make styles similar to regular text input component.

The build system has been migrated from rollup to pridepack, and the
propTypes for the components have been deprecated, as the prop typing is
now done in TypeScript type declarations.

The documentation is in the process of migration from Next to Storybook.
Issues with docgen remain for components with forwarded refs.

Add name prop for values to be bound in TextInput component.

Add value, defaultValue, and checked props to appropriate elements.

Add link to Feather Icons for the Icon component.

The styling of TextInput docs has been fixed.

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

Parse descriptions as Markdown. Also improve loading of current theme.

Add syntax highlighting + improved props table.

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

Display prop table in each component's props section

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.