Better control of scroll snap for calendar months on mobile

It is not a problem in desktop, because there is no scroll bar, but in
mobile you can scroll with touch, and i need the months to snap to the
start for the next and previous buttons to work.

web/static/public.css

@@ -1125,12 +1125,14 @@ body > footer > div, .campsite_type_features, .campsite_type_detail {
     scrollbar-width: none;
     -webkit-overflow-scrolling: touch;
     -ms-overflow-style: -ms-autohiding-scrollbar;
+    scroll-snap-type: x proximity;
 }
 
 .campsite_type_calendar table {
     border-collapse: collapse;
     flex: 0 0 27rem;
     height: 100%;
+    scroll-snap-align: center start;
 }
 
 .campsite_type_calendar td {