move from csslint to stylelint

docs/assets/less/responsive-tests.less

@@ -1,3 +1,5 @@
+/* stylelint-disable selector-no-qualifying-type, declaration-no-important */
+
 // Responsive (scrollable) doc tables
 .table-responsive .highlight pre {
   white-space: normal;
@@ -7,11 +9,11 @@
 .bs-table th small,
 .responsive-utilities th small {
   display: block;
-  font-weight: normal;
+  font-weight: 400;
   color: #999;
 }
 .responsive-utilities tbody th {
-  font-weight: normal;
+  font-weight: 400;
 }
 .responsive-utilities td {
   text-align: center;
@@ -36,7 +38,7 @@
   display: block;
   padding: 15px 10px;
   font-size: 14px;
-  font-weight: bold;
+  font-weight: 700;
   line-height: 1.1;
   text-align: center;
   border-radius: 4px;