Update links.yml

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancing link validation workflow for project documentation.

📊 Key Changes

• Syntax format improved in the link-checking commands for better readability and maintenance.
• Now uses a backslash (\) at the end of each line to clearly separate options and targets within the lychee validation command.
• Expanded the scope of link validation to include .html, .yml, .yaml, .py, and .ipynb files in the repository.

🎯 Purpose & Impact

• The improved format makes the workflow file easier to read and edit, which could help future maintainers. 🤓
• By expanding the file types checked, the likelihood of broken or stale links in the project's documentation decreases, ensuring a smoother experience for users accessing the resources. 📚
• Regularly checking for link validity across more file types helps maintain high-quality documentation, potentially reducing user frustration and improving trust in the project. 🛠️