MediaWiki theme: Copy .theme-oo-ui-outline{Controls,Option}Widget from Apex

Turns out this piece of code is critical for the outlines and assorted
UI to display correctly. Who would have thought?

Also:
* Adjusted outlineControlsWidget not to set unnecessary margins, which
  cause the bottom icon area to be *just* too wide, which results in
  scrollbar idiocy on Chrome.
* Changed colors for MediaWiki theme.

Bug: T78031
Bug: T78177
Bug: T78321
Change-Id: I19a986f2c950b9f4a76d023e02df816752383c47
Merge "MediaWiki theme: Copy .theme-oo-ui-outline{Controls,Option}Widget from Apex"