docs: add BMad Ecosystem cross-links to sidebar

[bmadcode]

Summary by CodeRabbit

• Documentation
  • Added a new "BMad Ecosystem" section to the website navigation with external links to BMad Method, Creative Intelligence Suite, Game Dev Studio, and Test Architect resources, each opening in a new tab.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4458ad9d-5a1a-4655-8029-1dcd5d2b9f07

📥 Commits

Reviewing files that changed from the base of the PR and between 2db3227 and cd90b57.

📒 Files selected for processing (1)

• website/astro.config.mjs

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Walkthrough

Added a new "BMad Ecosystem" sidebar section to the Astro configuration with four external link items (BMad Method, Creative Intelligence Suite, Game Dev Studio, Test Architect) configured to open in new tabs.

Changes

Cohort / File(s)	Summary
Configuration Update website/astro.config.mjs	Added a new "BMad Ecosystem" sidebar section with four external link items configured to open in new tabs, extending the Starlight sidebar configuration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A hop, skip, and a jump through config we go,
New paths to BMad wisdom now on show!
Four vibrant links in the sidebar's gleam,
Opening new tabs like a rabbit's dream,
The ecosystem grows, both bold and bright! ✨

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs-update

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