Fix for topbar dropdown arrow position when height of topbar is increased.

The topbar dropdown arrow has a `top` position of 22px. This is
hardcoded assuming the default topbar height of 45px hasn't changed.
This fix, fixes the position of the topbar dropdown arrow so that its
top position is `$topbar-height / 2`. It also fixes maintains
consistent padding as the topbar height is changed.
Edit doc pages
Merge pull request #2248 from lukebussey/topbar-dropdown-arrow

Fix for topbar dropdown arrow position when height of topbar is increased.
Merge pull request #2265 from abutler3/Doc_editing

Edit doc pages