I need several updates made to this header.
1. I want the nav bar to remain expanded in medium view and only collapse when the screen gets to small size.
2. Align the user avatar to the right with the nav bar is in medium or larger view.
3. Align the user avatar to the left when the nav bar is in small or xs.
4. Implement a popover that displays when the user clicks the avatar, similar to the popovers that can be found here: [login to view URL]