docs: add BMad Ecosystem cross-links to sidebar

[bmadcode]

Summary

• Adds a "BMad Ecosystem" sidebar group linking to BMad Method, CIS, Game Dev Studio, and TEA docs sites
• Links open in new tabs

Test plan

• Sidebar config follows same pattern verified on BMad Method dev server

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e9df43d6-3113-4c09-8f78-d851cb4ffde5

📥 Commits

Reviewing files that changed from the base of the PR and between 2f9d986 and cd90b57.

📒 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 docs-update

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