Fix YOLOv8 links

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated the README links to point to a new URL for better resource navigation.

📊 Key Changes

• Changed the link URL in the README from https://ultralytics.com/yolov8 to https://ultralytics.com/yolo.
• Made the same URL update in the Chinese version of the README.

🎯 Purpose & Impact

• Improved Navigation: The updated link provides a more general resource page (/yolo) potentially offering access to various YOLO versions and resources, making it easier for users to find relevant information.
• Consistency: Ensures that both the English and Chinese versions of the README guide users to the same up-to-date location.