Add order first to grid (#24202)

* Add first class to grid framework to add negative ordering

* Add order-first explination to the docs

scss/mixins/_grid-framework.scss

@@ -46,6 +46,10 @@
         }
       }
 
+      .order#{$infix}-first {
+        order: -1;
+      }
+
       @for $i from 1 through $columns {
         .order#{$infix}-#{$i} {
           order: $i;