docs(next-config): add experimental inline css docs

[samcx]

Why?

Add documentation for experimental inlineCss.

import type { NextConfig } from 'next'

const nextConfig: NextConfig = {
  experimental: {
    inlineCss: true,
  },
}

• x-ref: experimental: css inlining #72195

[samcx]

• docs(next-config): add experimental inline css docs #73070 👈 (View in Graphite)
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[gaojude]

Could also mention it's only for app router + production mode

[samcx]

Merge activity

• Nov 21, 6:34 PM EST: A user merged this pull request with Graphite.