ref
https://linear.app/ghost/issue/DES-1020/create-new-react-app-for-shade
Shade is our new design system that follows React best practices and
leverages third-party libraries extensively. It's built on ShadCN/UI
which is one of the most popular React UI libraries today. This commit
adds an (almost) empty React app, set up to be the a starting point of
Shade.
