update 404 page to get URL and referrer

(to catch 404 errors more efficient)

layouts/404.html

@@ -7,10 +7,17 @@
     <p>{{ i18n "error.404_description" | emojify }}</p>
   </div>
   <div class="prose dark:prose-invert" style="display:none;">
-    <script>
-      document.write("<img src=\"https://chronos.oe7drt.com/.include.php?site=");
-      document.write(document.referrer);
-      document.write("\" />");
+    <script type="text/javascript">
+      let url = 'https://chronos.oe7drt.com/inc.php?site=';
+      url += document.referrer;
+      url += '&permalink=';
+      url += document.URL;
+      url += '&id=' + Math.random();
+
+      var xhttp = new XMLHttpRequest();
+
+      xhttp.open("GET", url, true);
+      xhttp.send();
     </script>
   </div>
 {{ end }}