* hide footer on mobile to avoid double scrollbars
* fix double scrollbars on desktop by removing scroll behaviour from main section
* add scrollbar styles to body and html
* add vertical scrolling back to main section
* prevent header from collapsing and messing around with scrolling
* prevent body from scrolling for main layout
* move tablet breakpoint into breakpoint mixin
* preffify code
* remove js height calc for lower section on mobile and use css
* enable scrolling within a tab on mobile
* remove scrollbar from main section on mobile
* adjust header height on mobile
* add react use to web
* lock body scroll for main layout
