docs: add Rule Types & Precedence (User vs Org vs Repo) + link-throughs

[codegen-sh]

Adds a new consolidated page and clarifies the override order across our docs.

What’s included:

• New page: Rules Overview (User, Organization, Repository) with clear precedence: Repo > Org > User
• Clarify hierarchy in Organization Rules page and cross-link to the overview
• Add a note in Repo Rules page linking to the overview
• Update docs navigation to include Rules Overview and ensure Org/Repo pages appear under Settings

Files:

• docs/settings/rules-overview.mdx (new)
• docs/settings/organization-rules.mdx (updated)
• docs/settings/repo-rules.mdx (updated)
• docs/docs.json (navigation updated)

Co-authored-by: Jay Hack jay@codegen.com

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💻 View my work • 👤 Initiated by Jay Hack • 💬 Initiated in #demo • About Codegen
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.