Change one-column breakpoint to 720px
Change one-column breakpoint to 720px

The breakpoint at which Wikipedia layouts change from two columns to one
is now at 720 pixels width, rather than 1024 pixels * (36/56). This is so
that the one-column layout happens at full screen on composite.

[endlessm/eos-sdk#3933]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib