Add Font instructions when adding to an existing project

[niclas-j]

See #68

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[mozzius]

As of Next.js 13.2, @next/font has been integrated into the core next package (see here), so no need to install an extra package.

Also, it would be nice to also provide instructions for non-Next usage!
You can do it purely in globals.scss as so:

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap");

@tailwind base;
@tailwind components;
@tailwind utilities;

:root {
  --font-sans: "Inter";
}

[shadcn]

@niclas-j Thanks for looking into this. I created an updated PR with docs for adding fonts. #1752

Marking this one as done. Feel free to reopen if not.

Thank you.