Style the manage folder link

Right-aligned so it lines up with the right edge of the page.

Moved down so its baseline aligns with the folder title.

In a narrower column so there’s more space for the folder title.

app/assets/stylesheets/components/message.scss

@@ -163,5 +163,10 @@
 
   }
 
+  &-manage-link {
+    display: block;
+    text-align: right;
+    padding: ($gutter - 2px) 0 0 0;
+  }
 
 }