Update site README links to use the correct MCP url

[rgllm]

Updates the Agents Docs MCP installation link in the README.
The previous URL was pointing to an incorrect location, causing installation to fail.

This is a simple change, not sure if is worth opening an issue.

[changeset-bot]

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Latest commit: fce9aaa

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[pkg-pr-new]

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commit: fce9aaa