ui: highlight rated contest (#233)

packages/ui-default/components/contest/contest.page.styl

@@ -1,5 +1,6 @@
 .contest-type-tag
 .contest-tag
+.contest-tag-rated
   font-size: rem($font-size-small)
   display: inline-block
   line-height: rem(22px)
@@ -11,6 +12,13 @@
     text-decoration: none
     color: #FFF !important
 
+.contest-tag-rated
+  background: orange
+  color: #FFF
+
+  .icon
+    margin-right: rem(5px)
+
 .contest-type-tag
   &, &:visited
     &, .supplementary &