docs: Add blog post about rootParams

[amannn]

Related to vercel/next.js#72837

→ Draft

TODO

• Wait until rootParams lands in Next.js stable
• Update publishing date
• If next-intl@4 is released before rootParams, adapt blog post
• Update Next.js version number

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
next-intl-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 19, 2025 0:22am
next-intl-example-app-router	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 19, 2025 0:22am
next-intl-example-app-router-without-i18n-routing	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 19, 2025 0:22am

[kklem0]

The previously deprecated locale argument will serve an edge case in the future once rootParams is a thing

@amannn shall we still use rootParams with v4.0.2 or is it not ready?

[amannn]

@kklem0 rootParams was silently released as unstable_rootParams in Next.js 15.2. The Next.js team hasn't publicly announced the feature yet and I think they're still ironing out some edges.

If you decide to give rootParams a try, you can leave a note in #1627 with your findings!