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

node_modules/widest-line/index.js

@@ -0,0 +1,11 @@
+import stringWidth from 'string-width';
+
+export default function widestLine(string) {
+	let lineWidth = 0;
+
+	for (const line of string.split('\n')) {
+		lineWidth = Math.max(lineWidth, stringWidth(line));
+	}
+
+	return lineWidth;
+}