Update README.md

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved documentation and internal API example for YOLOv5.

📊 Key Changes

• Updated README files to point to a new blog post and add "alt" text to the YOLO Vision banner images.
• Refactored README content for the Flask REST API and logger integration guides (ClearML and Comet) for better readability.
• Streamlined content by removing unnecessary whitespace and consolidating information into fewer paragraphs.

🎯 Purpose & Impact

• The change in the README banners leads users to a blog post about YOLOv8, helping them stay informed about the latest developments.
• The updates to the documentation make information about using REST APIs and logger integrations with YOLOv5 more accessible and easier to understand for developers.
• These updates may enhance user experience by simplifying navigation and comprehension of Ultralytics's tools and resources. 📈👩‍💻👨‍💻