Demo fails to run

[foxgrover]

Error: The NEXT_PUBLIC_CLERK_FRONTEND_API environment variable must be set to use the ClerkProvider component.

Also, the readme references a file that doesn't exist:

[API routes](https://nextjs.org/docs/api-routes/introduction) can be accessed on http://localhost:3000/api/hello. This endpoint can be edited in pages/api/hello.js.

The pages/api directory is mapped to /api/*. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.```