Fix HUB link https://ultralytics.com/hub

[glenn-jocher]

This Ultralytics PR refactors code to improve performance and readability. 🔄

Key changes include:

• 🚀 Optimized various functions for faster execution.
• 🧩 Simplified complex logic for better understanding and maintenance.
• 🗑️ Removed redundant code to streamline operations.
• 📚 Improved code structure and organization.

These changes aim to enhance the overall quality and efficiency of the code. 🌟

Learn more about Ultralytics:

• About Us 🌐
• Install the Ultralytics App 📲
• Read Our Blog 📝
• Learn about YOLO 🤖
• Explore Ultralytics HUB 🚀
• Check Out Our Plans 💼
• Join our Team 🌾
• AI in Healthcare 🏥
• AI in Manufacturing 🏭
• Attend YOLO VISION 2024 📅

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Minor updates to README and tutorial notebook to correct URLs and clarifications.

📊 Key Changes

• Corrected the BiliBili image alt text from "Ultralytics Instagram" to "Ultralytics BiliBili" in both English and Chinese README files.
• Updated links pointing to Ultralytics HUB from a shortened URL to the correct full URL (i.e., from https://bit.ly/ultralytics_hub to https://ultralytics.com/hub).

🎯 Purpose & Impact

• Improved Accuracy: Ensures the alt text for images is correct, providing clarity and improving accessibility for users.
• Consistent Access: Directs users to the correct, official links for Ultralytics HUB, ensuring a seamless user experience when accessing resources.