Add new doc describing mintignore

[k-finken]

Documentation changes

Added new page under organize to explain how and where to use .mintignore and what it does.

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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] Adds a new Organize doc for .mintignore and links it in navigation.

• Documentation:
  • New Page: organize/mintignore.mdx explaining .mintignore usage, examples, and pattern syntax; clarifies difference from hidden pages.
  • Navigation: Adds organize/mintignore to docs.json under the Organize group.

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