Additional changes:
* Address a fixme relating to the overflow icon and move some AMC styles
out of the critical path for non-AMC pages
Note about ellipsis:
The class mf-mw-ui-icon-rotate-clockwise cannot be used as it's part of
MobileFrontend and loaded via JS. Minerva must work without MobileFrontend
and this rotation is needed without JS.
Bug: T244444
Change-Id: Ifd02c50305cf036dd6df640d778678668507e5eb
