Add UTM enabled banner redirect

[RizwanMunawar]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates the README banner links to use a UTM-enabled redirect to the Ultralytics Platform for improved referral tracking 📈

📊 Key Changes

• Replaced the top banner link in README.md with a UTM-tagged Ultralytics Platform URL.
• Applied the same banner link update in README.zh-CN.md for consistency across localized documentation.
• Kept the existing banner image and placement unchanged, modifying only the destination URL.

🎯 Purpose & Impact

• Enables campaign and referral attribution for traffic coming from the GitHub README banner.
• Helps improve visibility into user acquisition and banner performance across repository entry points.
• Has minimal user-facing impact beyond redirecting banner clicks through a tracked platform URL.

[UltralyticsAssistant]

👋 Hello @RizwanMunawar, thank you for submitting a ultralytics/yolov5 🚀 PR! This is an automated message to help with review readiness, and an engineer will assist you shortly 😊 Please review the checklist below to help ensure a smooth integration:

• ✅ 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}

Good, minimal change overall, but both updated banner links currently use an invalid query-string format. Fixing the separators from repeated ? to & is necessary for the UTM tracking to work as intended.

💬 Posted 2 inline comments

[UltralyticsAssistant]

🔍 PR Review 2

_{Made with ❤️ by Ultralytics Actions}

This PR looks clean. It makes a small, consistent documentation-only change in both README files, and I don't see any functional or maintainability issues in the diff.

[pderrenger]

Thanks — this looks like a clean docs-only update, and keeping both README variants aligned makes the change straightforward to maintain.