Hide line numbers in responsive views
Sometimes I review small changes (like in the handbook directly on my mobile. I have a big screen now, but ~25% is just lost because I have 2 columns with line numbers. While I understand it makes sense for code review, most of the time, this is useless in other contexts. For code review, I'd wait to be on my computer to be in better conditions to comment.
I suggest removing by default the lines on responsive views, and html notifications:
The changes are pretty straightforward without the lines, and having the full width would be very helpful on mobile.