Reservation table responsive breakpoints

Issue: A high proportion of use cases involve showing 5-7 days in advance which looks fine on most desktop/tablet devices. But it runs off the screen on mobile. We could set it to 4 columns on all devices, but then it seems a shame not to display more columns on devices that can handle it. Fix: Either have this handled automatically, or allow the user to set a different number of columns by device breakpoint.