Add Google Analytics

front/src/main.html

@@ -35,5 +35,15 @@
     <div class="footer">
         <p><a href="/about">Learn more</a><br>If you like <b>Yellow Lab Tools</b>, <a href="https://github.com/gmetais/YellowLabTools" target="_blank" class="star">give it a <span>&#9733;</span> on GitHub</a>!</p>
     </div>
+
+    <script>
+        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+        })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+        if ('@@googleAnalyticsId'.indexOf('UA-') === 0) {
+            ga('create', '@@googleAnalyticsId', 'auto');
+        }
+    </script>
 </body>
 </html>