Move "What is Mintlify?" page

[ethanpalm]

Documentation changes

Moves conceptual info to the guides section

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Low Risk
Low risk since this only changes docs.json navigation ordering; main risk is minor UX churn or a missing page if the underlying what-is-mintlify doc doesn’t exist.

Overview
Moves the what-is-mintlify page out of the Documentation → Get started section and into Guides → Overview in docs.json, repositioning the conceptual “What is Mintlify?” content alongside guides/index.

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