Export Config type

[thecrypticace]

Right now the following does not work and instead produces a type error:

import { type Config } from 'tailwindcss'

export default {
  // … config here
} satisfies Config

We were not exporting a Config type but thankfully this already exists in the codebase so we just need to export it.

It does not have all properties of an existing config as not all features have been implemented (or in some cases necessary / relevant for v4).

Notably missing are:

• important
• prefix
• separator
• safelist
• blocklist
• future
• experimental
• corePlugins

Also, explicit keys for theme are not currently specified but we should probably bring this back even if just as an auto-complete aid.