Handles fonts with `next/font` in `web`

[anthonyshew]

Use the next/font package and wire it up for correct usage with Tailwind.

This only really needs to be handled for App Router code.

https://nextjs.org/docs/app/building-your-application/optimizing/fonts#with-tailwind-css

[anthonyshew]

Handle this once we've got at least one App Router page that we're working with.