Update README.md

[glenn-jocher]

Add discord badge @Burhan-Q

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updated README with streamlined badges and added Discord community link.

📊 Key Changes

• Consolidated CI and Colab badges for a cleaner look.
• Included a new badge linking directly to the Ultralytics Discord community.

🎯 Purpose & Impact

• Enhanced Readability: Simplifying the badge display improves visual clarity for readers.
• Community Engagement: Adding the Discord link encourages users to join the community, fostering support and collaboration. 🤝💬
• User Support: Direct Discord access means better real-time support and a platform for discussing issues and sharing insights. 🆘🚀

[sourcery-ai]

We have skipped reviewing this pull request. All the files appear to be documentation files, which we're not great at reviewing... yet!