docs: add assets for docs hub models

[sergiuwaxmann]

@glenn-jocher This PR adds the required assets for Ultralytics HUB Models Docs.
Also, it updates a few assets for Ultralytics HUB Projects Docs.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Visual updates to the Ultralytics Hub documentation.

📊 Key Changes

• Added new images for the documentation to demonstrate model and project management, including deleting, deploying, editing, previewing, sharing, training, and transferring models and projects.
• Replaced certain existing images in the documentation with updated versions.

🎯 Purpose & Impact

• Enhanced clarity: New visuals aim to improve the understanding of complex tasks within the Hub for both new and existing users.
• Better guidance: Updated images ensure users are looking at the latest version of the platform interface, streamlining their learning and usage experience.
• Increased engagement: Images make technical documentation more engaging and user-friendly which may improve the overall user satisfaction and reduce learning curve.

📈 Overall, these changes will make the Ultralytics Hub documentation more intuitive and helpful, potentially increasing user retention and lowering support requests.