added git banners

[RizwanMunawar]

@glenn-jocher

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Introducing brand-new YOLOv8 imagery assets! 🎉

📊 Key Changes

• Added a new banner image for YOLOv8 (banner-yolov8.png) in the im directory.
• Updated the existing YOLOv8 banner image in the yolov8 directory.
• Created a new vertical banner image for YOLOv8 (banner_vertical-yolov8.1.png) in the yolov8 directory.

🎯 Purpose & Impact

• These visual updates serve to refresh the branding and visual representation of YOLOv8. 🖼
• The new images can be used across various platforms to promote and visually identify the YOLOv8 model, enhancing recognition and adoption.
• Users can expect an updated and more engaging visual experience when interacting with YOLOv8 resources or documentation. ✨

[glenn-jocher]

@RizwanMunawar PR merged!