fix: move BMB announcement to custom Banner component

[bmadcode]

Summary

• Moved BMB announcement into Banner.astro as a second row (Starlight banner config doesn't render with custom Header)
• Removed unused Starlight banner config from astro.config.mjs

Test plan

• Verify both banners render on the docs site

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ac6a7bf0-a139-4d95-8acd-55e37f665b76

📥 Commits

Reviewing files that changed from the base of the PR and between 54f043a and de6d34d.

📒 Files selected for processing (2)

• website/astro.config.mjs
• website/src/components/Banner.astro

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-bmb-banner

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[augmentcode]

🤖 Augment PR Summary

Summary: Moves the community/marketplace announcement out of Starlight’s config banner into the custom Banner.astro so it renders with the custom header.
Removes the now-unused Starlight banner configuration from website/astro.config.mjs.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

website/src/components/Banner.astro:19 Adding a second banner row means the header’s total banner height is now 2× --ai-banner-height, but website/src/styles/custom.css still computes --sl-nav-height and header.header .header.sl-flex assuming only one banner; this can cause the header/banners to overflow or get clipped.

Severity: medium

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