chore(docs): relocate deprecated docusaurus option

[markscott-ms]

Description

Similar to #2023 but to the docs/ folder's docusaurus configuration that was missed at the time.

This is not an upgrade to docusaurus 4 (it isn't released) but addressed compatibility warnings issued during builds.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎨 Code style/formatting changes
• ♻️ Refactoring (no functional changes)
• ⚡ Performance improvements
• ✅ Test additions or updates
• 🔧 Chore (maintenance, dependencies, CI, etc.)

Affected Components

• CLI (cli/)
• Shared (shared/)
• CALM Widgets (calm-widgets/)
• CALM Hub (calm-hub/)
• CALM Hub UI (calm-hub-ui/)
• Documentation (docs/)
• VS Code Extension (calm-plugins/vscode/)
• Dependencies
• CI/CD

Commit Message Format ✅

Testing

• I have tested my changes locally
• I have added/updated unit tests
• All existing tests pass

Checklist

• My commits follow the conventional commit format
• I have updated documentation if necessary
• I have added tests for my changes (if applicable)
• My changes follow the project's coding standards

[Copilot]

Pull request overview

This PR completes the migration of the deprecated onBrokenMarkdownLinks Docusaurus configuration option that was started in PR #2023 but missed the docs/ folder. The change moves this property from the top-level configuration into the markdown.hooks section to comply with Docusaurus 3.9+ requirements and prepare for compatibility with Docusaurus 4.0.0.

Changes:

• Relocated onBrokenMarkdownLinks: 'warn' from top-level config to markdown.hooks.onBrokenMarkdownLinks: 'warn' in the docs folder's Docusaurus configuration

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