Load the tracker script by a script tag

The tag replicates what the previous inline script was doing, but is
declared rather than built.

Author: Daniel Arthur Gallagher

index.html

@@ -13,6 +13,8 @@
     });
   </script>
 
+  <script src="https://secure.gaug.es/track.js" async id="gauges-tracker" data-site-id="4f542216cb25bc2358000006"></script>
+
   <link rel="apple-touch-icon" sizes="57x57" href="icons/apple-icon-57x57.png">
   <link rel="apple-touch-icon" sizes="60x60" href="icons/apple-icon-60x60.png">
   <link rel="apple-touch-icon" sizes="72x72" href="icons/apple-icon-72x72.png">
@@ -209,18 +211,5 @@ <h2>Quantifiers</h2>
       <p>Created by <a href="http://theprogrammingbutler.com" rel="noopener">Hoyt</a> and maintained by <a href="https://github.com/jonmagic/scriptular#contributors" rel="noopener">many</a>. To contribute or report an issue visit <a href="https://github.com/jonmagic/scriptular" rel="noopener">the project on GitHub</a>.</p>
     </div>
   </div>
-
-  <script>
-    var _gauges = _gauges || [];
-    (function() {
-      var t   = document.createElement('script');
-      t.async = true;
-      t.id    = 'gauges-tracker';
-      t.setAttribute('data-site-id', '4f542216cb25bc2358000006');
-      t.src = 'https://secure.gaug.es/track.js';
-      var s = document.getElementsByTagName('script')[0];
-      s.parentNode.insertBefore(t, s);
-    })();
-  </script>
 </body>
 </html>