Update Ultralytics Platform banner

[RizwanMunawar]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates the Ultralytics Platform banner image in the project README files. 🖼️

📊 Key Changes

• Replaced the Ultralytics HUB logo image source in README.md
• Applied the same banner update in README.zh-CN.md

🎯 Purpose & Impact

• Keeps branding assets current and consistent across English and Chinese READMEs ✅
• Improves the visual presentation of the Ultralytics Platform section for readers 📌

[UltralyticsAssistant]

👋 Hello @RizwanMunawar, thank you for submitting a ultralytics/yolov5 🚀 PR! To ensure a seamless integration of your work (this is an automated message—an engineer will assist soon), please review the following checklist:

-✅ Define a Purpose: Clearly explain the purpose of your fix or feature in your PR description, and link to any relevant issues. Ensure your commit messages are clear, concise, and adhere to the project's conventions.
-✅ Synchronize with Source: Confirm your PR is synchronized with the ultralytics/yolov5 main branch. If it's behind, update it by clicking the 'Update branch' button or by running git pull and git merge main locally.
-✅ Ensure CI Checks Pass: Verify all Ultralytics Continuous Integration (CI) checks are passing. If any checks fail, please address the issues.
-✅ Update Documentation: Update the relevant documentation for any new or modified features.
-✅ Add Tests: If applicable, include or update tests to cover your changes, and confirm that all tests are passing.
-✅ Sign the CLA: Please ensure you have signed our Contributor License Agreement if this is your first Ultralytics PR by writing "I have read the CLA Document and I sign the CLA" in a new message.
-✅ Minimize Changes: Limit your changes to the minimum necessary for your bug fix or feature addition. "It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is." — Bruce Lee

For more guidance, please refer to our Contributing Guide. Don't hesitate to leave a comment if you have any questions. Thank you for contributing to Ultralytics! 🚀

[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

Found one functional issue: the new image URLs use blob instead of raw, so the logos won't render. Updating to the raw URL should resolve it. Otherwise the change is clean.

💬 Posted 2 inline comments

[pderrenger]

Thanks for the update—please confirm the new banner is an unmodified official asset (no recolors/cropping/stretch), includes a link to Ultralytics Platform, and meets the logo readability/contrast guidance in the Ultralytics Brand guidelines before we merge.