Update hub.ipynb

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced links for better community engagement on the Ultralytics HUB notebook.

📊 Key Changes

• Improved Formatting: Adjusted the formatting of existing GitHub Actions and Google Colab badges.
• New Community Links: Added new badges linking to Ultralytics Forums and Ultralytics Reddit community.

🎯 Purpose & Impact

• Better Readability: Enhanced format makes existing badges easier to view and more appealing.
• Increased Engagement: New links to forums and Reddit will help users connect more easily with the Ultralytics community, fostering better support and collaboration.

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