theme add?

searx/static/themes/kvanDark/src/js/head/00_init.js

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+(function (w, d) {
+  'use strict';
+
+  // add data- properties
+  var script = d.currentScript  || (function () {
+    var scripts = d.getElementsByTagName('script');
+    return scripts[scripts.length - 1];
+  })();
+
+  w.searxng = {
+    settings: JSON.parse(atob(script.getAttribute('client_settings')))
+  };
+
+  // update the css
+  var hmtlElement = d.getElementsByTagName("html")[0];
+  hmtlElement.classList.remove('no-js');
+  hmtlElement.classList.add('js');
+
+})(window, document);