clear out docs css

docs/assets/scss/_responsive-tests.scss

@@ -10,86 +10,8 @@
 }
 
 // Utility classes table
-.bd-table th small,
-.responsive-utilities th small {
+.bd-table th small {
   display: block;
   font-weight: normal;
   color: #999;
 }
-.responsive-utilities tbody th {
-  font-weight: normal;
-}
-.responsive-utilities td {
-  text-align: center;
-}
-.responsive-utilities .is-visible {
-  color: #468847;
-  background-color: #dff0d8 !important;
-}
-.responsive-utilities .is-hidden {
-  color: #ccc;
-  background-color: #f9f9f9 !important;
-}
-
-// Responsive tests
-.responsive-utilities-test {
-  margin-top: .25rem;
-}
-.responsive-utilities-test .col-6 {
-  margin-top: .5rem;
-  margin-bottom: .5rem;
-}
-.responsive-utilities-test span {
-  display: block;
-  padding: 1rem .5rem;
-  font-size: 1rem;
-  font-weight: bold;
-  line-height: 1.1;
-  text-align: center;
-  border-radius: .25rem;
-}
-.visible-on,
-.hidden-on {
-  .col-6 {
-    > .not-visible {
-      color: #999;
-      border: 1px solid #ddd;
-    }
-  }
-}
-.visible-on,
-.hidden-on {
-  .col-6 {
-    .visible {
-      color: #468847;
-      background-color: #dff0d8;
-      border: 1px solid #d6e9c6;
-    }
-  }
-}
-
-@include media-breakpoint-only(xs) {
-  .hidden-xs-only {
-    display: none !important;
-  }
-}
-@include media-breakpoint-only(sm) {
-  .hidden-sm-only {
-    display: none !important;
-  }
-}
-@include media-breakpoint-only(md) {
-  .hidden-md-only {
-    display: none !important;
-  }
-}
-@include media-breakpoint-only(lg) {
-  .hidden-lg-only {
-    display: none !important;
-  }
-}
-@include media-breakpoint-only(xl) {
-  .hidden-xl-only {
-    display: none !important;
-  }
-}