Add HUB Cloud Training banners

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

New and updated visuals for the Ultralytics Hub branding.

📊 Key Changes

• Added a new image file: ultralytics-hub-vertical.png.
• Updated the existing image file: ultralytics-hub.png.

🎯 Purpose & Impact

• The new image provides an alternative branding option with a vertical layout, likely for varied marketing or documentation needs.
• The update to the existing image could involve a refreshed design, ensuring the Ultralytics branding remains modern and engaging.
• Users will experience a more visually consistent and updated brand presence when interacting with Ultralytics products or services. 🎨