Cleanup breadcrumb divider last item

Modify to hide both padding and leading/trailing whitespace
Thanks to https://github.com/holic for suggestion

docs/assets/css/bootstrap.css

@@ -4024,7 +4024,7 @@ button.close {
 }
 
 .breadcrumb > li:last-child:after {
-  content: "";
+  display: none;
 }
 
 .breadcrumb > .active {

less/breadcrumbs.less

@@ -19,7 +19,7 @@
       color: #ccc;
     }
     &:last-child:after {
-      content: ""; // No divider after last element
+      display: none; // No divider after last element
     }
   }
   > .active {