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

Updated URLs in the documentation and source files to the new Ultralytics HUB link.

📊 Key Changes

• Replaced "https://bit.ly/ultralytics_hub" links with "https://ultralytics.com/hub" in README, README.zh-CN, and notebook files.
• Corrected typos in image alt texts (e.g., changed "Instagram" to "BiliBili").

🎯 Purpose & Impact

• Improved Accessibility: Direct links improve user navigation and trust.
• Consistency: Ensures all documentation points to the correct HUB URL.
• Error Fixing: Corrects minor alt text errors, enhancing clarity for users.

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