Add documentation for cloning repo from mintlify-community

[mintlify]

Added section explaining how users who skipped Git connection during onboarding can clone their repository from mintlify-community to their own account via Git Settings. Includes explanation of public vs private repository visibility options.

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Created by Mintlify agent

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Note

Adds a new "Clone to your own repository" section to deploy/github.mdx outlining how to move docs from mintlify-community to a user/org repo.

• Provides step-by-step instructions via Git Settings, explains public vs private clone options, and links to installing the GitHub App

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