ENH: Clean up navbar spacing on mobile

[choldgraf]

This is a small improvement to the spacing of icons on mobile. It adds a bit of vertical spacing and makes the icon links stack horizontally.

See this before/after GIF:

[damianavila]

I like the change... it is an improvement because it is eating less vertical space.
Maybe there is a way to have all the switchers and icons aligned in one horizontal line?

[choldgraf]

OK - the latest push applies the same logic to all navbar-end items, so anything in the right-most navbar area should now be stacked horizontally.

[choldgraf]

Will merge this one as I think that I addressed your suggestion

[damianavila]

Thanks!