docs: remove RC banner

[Hugos68]

yeah... that, thanks @TGlide

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Project	Deployment	Preview	Comments	Updated (UTC)
www.skeleton.dev	Ready	Preview	Comment	Oct 13, 2025 7:20pm

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Project	Deployment	Preview	Comments	Updated (UTC)
themes.skeleton.dev	Skipped			Oct 13, 2025 7:20pm

[Copilot]

Pull Request Overview

This PR removes the Release Candidate (RC) warning banner from the Skeleton v4 migration documentation, indicating that v4 is no longer in RC status and the warning is obsolete.

• Removed RC warning alert component and import from migration documentation

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[endigo9740]

Thanks @TGlide