fix: update CSS override url attempt 2

[willhennessy]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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PR-Codex overview

This PR updates the link in the Styling.tsx file to point to the correct GitHub source for CSS configuration instructions.

Detailed summary

• Updated the href attribute of ExternalLink component to point to the correct GitHub source for CSS configuration instructions.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	❌ Failed (Inspect)			Jul 23, 2024 6:35pm
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