The values have slightly changed:
- Tablet breakpoint is decreased by 80px,
pushing lesser devices into a mobile only experience but
should make barely a difference to vast majority of our users.
- Biggest difference is in `min-width-breakpoint-desktop`,
which is increased by 120px in comparison to
`@width-breakpoint-desktop: 1000px`
Also removing one out-dated feature phone clause.
TECHNICAL CHANGES:
* The previous breakpoint was tied to the maximum content width.
The previous maximum content width is preserved, and several media
queries are adjusted to make use of it.
* The header (logo) is not optimized for 640px-720px. For now
a temporary fix is but in place which will be investigated as part
of T366859
VISUAL CHANGES:
* 6 visual changes which improve alignment in language and
visual editor overlay and diffs (where wikidiff2 is not
installed)
Bug: T349793
Depends-On: I3afba8c51f60de9271054499bfa3ffbcc1a9d779
Change-Id: I9552d8ad7509aae90e15edda26e786465773d3ac
