udpate 404 template to catch missing files

layouts/404.html

@@ -0,0 +1,16 @@
+{{ define "main" }}
+  <h1 class="mb-3 text-4xl font-extrabold">{{ i18n "error.404_title" | emojify }}</h1>
+  <p class="mt-8 mb-12 text-neutral-400 dark:text-neutral-500">
+    {{ i18n "error.404_error" | emojify }}
+  </p>
+  <div class="prose dark:prose-invert">
+    <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>
+  </div>
+{{ end }}