Remove unused CSS

This stuff if leftover from when we used to have the sidebar of links
next to each template.

app/assets/stylesheets/components/message.scss

@@ -18,30 +18,4 @@
     pointer-events: none;
   }
 
-  &-updated-at {
-    @include copy-16;
-    color: $secondary-text-colour;
-    margin: 0 0 5px 0;
-  }
-
-  &-use-links {
-
-    @include copy-16;
-    margin-top: -7px;
-    color: $secondary-text-colour;
-
-    a {
-      @include core-19;
-      display: block;
-      margin-bottom: 5px;
-      text-decoration: none;
-
-      &:hover {
-        text-decoration: underline;
-      }
-
-    }
-
-  }
-
 }