Update README.zh-CN.md

[glenn-jocher]

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to the YOLOv5 project documentation, emphasizing a transition to YOLOv8.

📊 Key Changes

• 🖼️ Image splash in README.md and README.zh-CN.md updated from fixed width to full width.
• 🗑️ Removed outdated sections detailing YOLOv5 segmentation models and documentation.
• 🚀 Introduced YOLOv8 with new links pointing to the project and documentation.
• 📦 Provided instructions to install the ultralytics package with pip.
• ✨ Restored a previously deleted section with segmentation models info and example commands.
• 🧹 Cleanup: Removed an unrelated "APP" section concerning the Ultralytics mobile app.

🎯 Purpose & Impact

• 🌐 The visual change to image sizing makes the documentation more responsive and visually appealing across different devices.
• 🧹 The removal of outdated parts and cleanup reflect a focus on current offerings, potentially indicating a phased update toward the newer YOLOv8.
• 💡 By directing users to YOLOv8 resources, Ultralytics is steering the community towards their latest technology, ensuring users have access to the most advanced and user-friendly tools they provide.
• 🛠️ The reinstated YOLOv5 segmentation model details ensure that existing users still have access to necessary resources for their ongoing projects.