LPS-41641 On a mobile device, cannot scroll through Add document type…

Hey @jonmak

This is an update for LPS-41641. Nate asked me to abstract the repeated logic in the nav_bar and nav_itam taglibs into a module. He also said to try configuring it to just toggle on and off on mobile devices instead of hiding on clickoutside to prevent the menus from collapsing on scroll. Let me know if you have any questions.