feat: add new section to build-with-ai.mdx

[johnnygerard]

Add the MCP configuration for GitHub Copilot coding agent.

Screenshot showing success (taken from GitHub Copilot agent session):

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en/guides/build-with-ai.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[Copilot]

Pull request overview

This PR adds documentation for configuring the Astro Docs MCP server with GitHub Copilot's coding agent feature, expanding the list of AI tools that can integrate with Astro's documentation server.

• Adds a new "GitHub Copilot Coding Agent" subsection under the MCP server installation guide
• Includes configuration instructions with a JSON example showing the MCP server setup
• Provides a link to GitHub's official documentation for the coding agent feature

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💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ArmandPhilippot]

Thank you for this addition! I've left some suggestions for using similar wording to the other sections. Please check this is correct (especially the first sentence) as I'm not familiar with GitHub Copilot.

[johnnygerard]

@ArmandPhilippot I accepted your changes and added an extra blank line. Preview deployment is ready for your review.

[ArmandPhilippot]

Thank you for adding this new section, and welcome to Team Docs! 🥳