Update README.md

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated badges in the Ultralytics documentation README for better clarity and accuracy.

📊 Key Changes

• Removed the badge linking to the Ultralytics JSON2YOLO repository workflow, which was not relevant to the current documentation repository.
• Kept badges for build deployment and broken link checks, ensuring they accurately reflect the status of the documentation repository.

🎯 Purpose & Impact

• Improved Clarity: Eliminating the unrelated badge helps prevent confusion, making it clear which automated processes apply to the Ultralytics Docs.
• Enhanced Accuracy: Maintaining and correcting the badges ensures users have up-to-date information on the health of the documentation, such as successful deployment and link integrity.
• User Trust: Accurate and relevant badges contribute to user trust, as they can see at a glance that the documentation is well-maintained.