docs: disable domain redirection

[chenjiahan]

Summary

Disable domain redirection as DNS records need time to propagate (spread) across DNS servers worldwide.

https://www.whatsmydns.net/#NS/rsbuild.rs

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR disables the automatic redirection from rsbuild.dev to rsbuild.rs pending DNS propagation.

• The redirection block has been commented out.
• The default catch-all redirect remains active.

[Copilot]

[nitpick] If the rsbuild.dev redirection is no longer required, consider removing the commented-out block to reduce clutter. If it's kept for future reference, adding a note explaining its temporary nature could be helpful.