Remove unused SCSS file ui_dev_kit.scss

app/assets/stylesheets/_page_specific_files.scss

@@ -60,6 +60,5 @@
 @import './pages/tags';
 @import './pages/tree';
 @import './pages/trials';
-@import './pages/ui_dev_kit';
 @import './pages/users';
 @import './pages/wiki';

app/assets/stylesheets/pages/ui_dev_kit.scss

-.gitlab-ui-dev-kit {
-  > h2 {
-    margin: 35px 0 20px;
-    font-weight: $gl-font-weight-bold;
-  }
-
-  .example {
-    padding: 15px;
-    border: 1px dashed $gray-100;
-    margin-bottom: 15px;
-
-    &::before {
-      content: 'Example';
-      color: $ui-dev-kit-example-color;
-    }
-  }
-}