Add very simple search support to pages, togglable with "k"

resources/scripts/plugins/useEventListener.ts

@@ -0,0 +1,23 @@
+import { useEffect, useRef } from 'react';
+
+export default (eventName: string, handler: any, element: any = window) => {
+    const savedHandler = useRef<any>(null);
+
+    useEffect(() => {
+        savedHandler.current = handler;
+    }, [handler]);
+
+    useEffect(
+        () => {
+            const isSupported = element && element.addEventListener;
+            if (!isSupported) return;
+
+            const eventListener = (event: any) => savedHandler.current(event);
+            element.addEventListener(eventName, eventListener);
+            return () => {
+                element.removeEventListener(eventName, eventListener);
+            };
+        },
+        [eventName, element],
+    );
+};