Collapsible Sidebar using Bootstrap 5

Welcome to the improved Bootstrap 5 sidebar! This sidebar has been completely fixed and enhanced with modern features. It includes proper Bootstrap 5 syntax, working collapse functionality, smooth animations, and responsive design.

The sidebar now includes Font Awesome icons, proper dropdown menus that work correctly, and smooth transitions. All the previous issues have been resolved including the typo in class names, outdated Bootstrap attributes, and missing CSS styles.