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

node_modules/micromark-extension-gfm-footnote/dev/lib/syntax.d.ts

@@ -0,0 +1,9 @@
+/**
+ * Create an extension for `micromark` to enable GFM footnote syntax.
+ *
+ * @returns {Extension}
+ *   Extension for `micromark` that can be passed in `extensions` to
+ *   enable GFM footnote syntax.
+ */
+export function gfmFootnote(): Extension;
+import type { Extension } from 'micromark-util-types';