add cookie domain

.ci/analytics/head.html

@@ -9,6 +9,7 @@
         cookieName: "lap",
         bots: /bot|crawler|spider|crawling/i,
         timeout_hidebanner: "500",
+        cookieDomain: "courses.lcsb.uni.lu"
     };
 </script>
 <script src="https://analytics.lcsb.uni.lu/lap/static/js/jquery.min.js"></script>