Further improve styleguide trigger styles

- Add some more space to the right on desktop
- Remove `text-decoration`
- Use correct `line-height` for the icon

public/resources/css/module/_footer.scss

@@ -92,6 +92,8 @@
     position: relative;
 
     .styleguide-trigger {
+      text-decoration: none;
+      margin-right: $unit * 2;
       opacity: .24;
       float: right;
 
@@ -99,10 +101,15 @@
       screen and (max-device-width: $phone-breakpoint),
       screen and (max-width: $tablet-breakpoint) {
         display: block;
-        margin-top: 8px;
+        margin-top: $unit;
+        margin-right: 0;
         font-size: 18px;
         float: none;
       }
+
+      .icon-favorite {
+        line-height: 20px;
+      }
     }
   }
 }