Improve assets README usage guidance

[Burhan-Q]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

This PR improves the ultralytics/assets README by clarifying how to link to assets directly and by documenting the repository’s folder structure for easier navigation 📘✨

📊 Key Changes

• Added guidance to use raw GitHub URLs for stable asset links in documentation, notebooks, websites, and examples 🔗
• Included a concrete example showing the direct raw URL for the Ultralytics logo 🖼️
• Added a new Repository Layout section that explains the purpose of key folders like logo/, social/, docs/, im/, app/, and YOLO-related asset directories 📂
• Expanded README documentation without changing any actual asset files or dataset contents 📝

🎯 Purpose & Impact

• Makes it easier for users to find and reuse assets correctly across projects, presentations, and documentation ✅
• Helps maintain more reliable links by pointing users to raw GitHub URLs instead of less stable browsing links 🌐
• Improves onboarding for new contributors and users by giving a clearer overview of what each folder contains 🚀
• Reduces confusion when searching for logos, images, screenshots, and YOLO-related visuals, saving time for both technical and non-technical users ⏱️

[glenn-jocher]

Thanks @Burhan-Q. I rescued this PR by removing the RKNN wheel/checksum additions and keeping the final diff focused on README improvements: raw asset URL guidance plus a concise repository layout.\n\nValidated:\n- final PR diff is README.md only\n- git diff --check\n- Ultralytics Actions passed

[UltralyticsAssistant]

Merged — fantastic improvement to the ultralytics/assets README 🎉

As Leonardo da Vinci said, “Simplicity is the ultimate sophistication.” This update reflects that perfectly by making asset linking clearer, navigation easier, and the repository more approachable for everyone.

Big thanks to @Burhan-Q for the thoughtful documentation enhancements, and to @glenn-jocher for contributing to the effort. The added guidance on raw GitHub URLs and the new repository layout will make asset discovery and reuse much smoother for the community.