Taxonomy by shadcn

[Taxonomy](https://github.com/shadcn-ui/taxonomy) is an open-source app built by shadcn (creator of shadcn/ui) to show off everything new in the Next.js App Router. It includes a real marketing site, a dashboard, an MDX-powered blog and docs, authentication via NextAuth, and Stripe subscriptions with a working billing page. Styling is Tailwind CSS with shadcn/ui components and a dark mode toggle. It is a reference project rather than a CLI, so the value is reading clean, current code and lifting patterns straight into your own build.