docs: add BMad Builder announcement banner

[bmadcode]

Summary

• Adds Starlight announcement banner to the docs site promoting BMad Builder module creation and marketplace submission
• Links to the Build Your First Module tutorial and Distribute Your Module how-to on the BMB docs site

Test plan

• Verify docs site builds and banner renders correctly

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7464f9e7-c30f-4b45-a11a-861bcfe6880a

📥 Commits

Reviewing files that changed from the base of the PR and between 6837ea6 and 5ff0090.

📒 Files selected for processing (1)

• website/astro.config.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds a Starlight announcement banner on the docs site to promote BMad Builder module creation and marketplace submission.

Changes: Configures banner.content in website/astro.config.mjs with links to the “Build Your First Module” tutorial and “Distribute Your Module” guide.

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[augmentcode]

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