remove obsolete ga script from demo sites (#461)

src/main.js

@@ -3943,29 +3943,7 @@ function finalizePage() {
     $(".shorten").shorten();
     enableTooltipsAndPopovers();
 
-    if (isDemo) {
-        // do not to give errors on netdata demo servers for 60 seconds
-        NETDATA.options.current.retries_on_data_failures = 60;
-
-        // google analytics when this is used for the home page of the demo sites
-        // this does not run on user's installations
-        setTimeout(function () {
-            (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', 'https://www.google-analytics.com/analytics.js', 'ga');
-
-            ga('create', 'UA-64295674-3', 'auto');
-            ga('send', 'pageview', '/demosite/' + window.location.host);
-        }, 2000);
-    } else {
+    if (!isDemo) {
         notifyForUpdate();
     }