Update from support feedback: private repo missing on second deployment

[mintlify]

Summary

Add a help center article documenting the ?private=true re-authorize URL used when a private GitHub repo doesn't appear in the onboarding repo picker for a second Mintlify deployment. Support has had to share this internal URL manually because the initial GitHub authorization only requests the public_repo scope, so returning to onboarding reuses that authorization and never prompts for private-repo access.

Changes

• Added help-center/private-repo-missing-when-creating-second-deployment.mdx with the symptom, the https://app.mintlify.com/api/onboarding/github/authorize?private=true URL, follow-up steps for the GitHub App repository access list, and a link back to deploy/github for a full connection reset.
• Registered the new page in the Help center group in docs.json.

Support context

• Multiple docs sites from the same repository

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Note

Low Risk
Documentation-only Help center content and nav entries; no product or auth-code changes.

Overview
Adds a Help center article for when a private GitHub repo does not appear in the onboarding picker while creating a second Mintlify deployment from the same repo.

The article explains that the first GitHub auth only grants public_repo and is reused on later onboarding, then documents the ?private=true re-authorize URL, GitHub App repository-access follow-up, and a link to GitHub App connection issues. The page is registered in EN, ES, FR, and ZH nav.

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