Remove mdformat

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

This PR enhances the formatting and labeling actions in Ultralytics workflows to improve code consistency and efficiency.

📊 Key Changes

• Extended Prettier Support: Prettier now formats YAML, JSON, Markdown, and CSS files. 🖌️
• Markdown Tool Update: Switched from mdformat to Prettier for consistent Markdown formatting. 📑
• Reduced PR Delay: Shortened wait time for fetching new PR data from 60 seconds to 20 seconds. ⏱️

🎯 Purpose & Impact

• Improved Code Consistency: Ensures all relevant file types are consistently formatted, leading to cleaner and more maintainable code. 🧹
• Streamlined Workflows: More efficient and faster PR processing by reducing the wait time for new PR data. 🚀
• Simplified Configuration: Using a single tool (Prettier) for multiple file types simplifies the setup and management of formatting rules. 🤖