Merge pull request #12354 from overleaf/revert-12330-jel-grid-3-and-4-col

Revert "[web] Add 3 and 4 column options to `Layout | Grid` on the CMS"

GitOrigin-RevId: fea5f87e74fe9915f4ee7653ed60ff4261b4d144

services/web/frontend/stylesheets/app/cms-page.less

@@ -379,11 +379,3 @@
     }
   }
 }
-
-.reverse-col-order-mobile {
-  @media (max-width: @screen-sm-min) {
-    display: flex;
-    flex-flow: column;
-    flex-direction: column-reverse;
-  }
-}