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

node_modules/pkg-dir/index.js

@@ -0,0 +1,17 @@
+'use strict';
+const path = require('path');
+const findUp = require('find-up');
+
+const pkgDir = async cwd => {
+	const filePath = await findUp('package.json', {cwd});
+	return filePath && path.dirname(filePath);
+};
+
+module.exports = pkgDir;
+// TODO: Remove this for the next major release
+module.exports.default = pkgDir;
+
+module.exports.sync = cwd => {
+	const filePath = findUp.sync('package.json', {cwd});
+	return filePath && path.dirname(filePath);
+};