Added analytics

static/head.html

@@ -7,4 +7,13 @@
 <script src="/external/mousetrap.min.js"></script>
 <script src="/main.js"></script>
 <link href="/external/css/Roboto.css" rel="stylesheet">
-<link rel="icon" href="/favicon.ico" type="image/x-icon" />
+<link rel="icon" href="/favicon.ico" type="image/x-icon" />
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-124032859-1"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-124032859-1');
+</script>