LPS-43118 - Dockbar Page Customization Bar not positioned for mobile

https://issues.liferay.com/browse/LPS-43118

Hey Nate,

Rebased with master. I didn't style the dockbar menu links in _styled theme because this pull was getting a bit large. I thought it would be better to fix that in another ticket and maybe try and condense/reorganize some of the repeated styles in dockbar.css in another ticket as well.

Patrick