Add MCP instructions for Google Antigravity

[jhuleatt]

Description (required)

Instructions for adding the Astro Docs MCP server to Google Antigravity.

While the other instructions use Astro docs as the MCP server name, Antigravity doesn't allow spaces in the key of an MCP server entry, so I used astro-docs instead.

I've also posted a guide with screenshots here.

[astrobot-houston]

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en/guides/build-with-ai.mdx	Source changed, localizations will be marked as outdated.

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[sarah11918]

Thank you, this looks great!