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

node_modules/retext/index.d.ts

@@ -0,0 +1,10 @@
+/// <reference types="retext-latin" />
+
+import type {Root} from 'nlcst'
+import type {Processor} from 'unified'
+
+/**
+ * Create a new unified processor that already uses `retext-latin` and
+ * `retext-stringify`.
+ */
+export const retext: Processor<Root, undefined, undefined, Root, string>