Add license header

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Added license comment to the utils.py file in the Ultralytics MkDocs plugin.

📊 Key Changes

• Inserted a comment at the top of the utils.py file indicating the Ultralytics MkDocs plugin and its AGPL-3.0 license.

🎯 Purpose & Impact

• Clarification: Ensures that users and contributors are aware of the licensing for this specific file. 📜
• Transparency: Promotes clearer documentation and compliance with open-source licensing requirements. 🔍

[sourcery-ai]

🧙 Sourcery has finished reviewing your pull request!

---

Tips

• Trigger a new Sourcery review by commenting @sourcery-ai review on the pull request.
• Continue your discussion with Sourcery by replying directly to review comments.
• You can change your review settings at any time by accessing your dashboard:
  • Enable or disable the Sourcery-generated pull request summary or reviewer's guide;
  • Change the review language;
• You can always contact us if you have any questions or feedback.

[sourcery-ai]

We've reviewed this pull request using the Sourcery rules engine. If you would also like our AI-powered code review then let us know.