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

node_modules/mdast-util-to-hast/index.js

@@ -0,0 +1,7 @@
+// Note: types exposed from `index.d.ts`.
+export {handlers as defaultHandlers} from './lib/handlers/index.js'
+export {toHast} from './lib/index.js'
+export {
+  defaultFootnoteBackContent,
+  defaultFootnoteBackLabel
+} from './lib/footer.js'