Refactor routing in App component to enhance navigation and improve error handling by integrating dynamic routes and updating the NotFound route.

node_modules/is-arrayish/index.js

@@ -0,0 +1,9 @@
+module.exports = function isArrayish(obj) {
+	if (!obj || typeof obj === 'string') {
+		return false;
+	}
+
+	return obj instanceof Array || Array.isArray(obj) ||
+		(obj.length >= 0 && (obj.splice instanceof Function ||
+			(Object.getOwnPropertyDescriptor(obj, (obj.length - 1)) && obj.constructor.name !== 'String')));
+};