Ultralytics Asset URL Update

[glenn-jocher]

This Ultralytics PR refactors code to improve performance and readability. 🔄

Key changes include:

• 🚀 Optimized various functions for faster execution.
• 🧩 Simplified complex logic for better understanding and maintenance.
• 🗑️ Removed redundant code to streamline operations.
• 📚 Improved code structure and organization.

These changes aim to enhance the overall quality and efficiency of the code. 🌟

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated various download URLs to point to Ultralytics' new asset repository.

📊 Key Changes

• Changed image source URLs in README.md and README.zh-CN.md from yolov5/releases to assets/releases.
• Modified dataset download URLs in several YAML files and scripts (e.g., GlobalWheat2020.yaml, VOC.yaml, VisDrone.yaml).
• Updated font file download URL in utils/general.py.

🎯 Purpose & Impact

• Centralized Assets: Consolidates all assets into a single repository for better management and accessibility 🔄.
• Reduced 404 Errors: Ensures that the download links remain functional, reducing the risk of broken links 📂.
• Streamlined Updates: Facilitates easier updates and maintenance of resources, improving the user experience and development efficiency 🚀.