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

node_modules/astro/dist/cli/exec.d.ts

@@ -0,0 +1,5 @@
+import { type Options } from 'tinyexec';
+/**
+ * Improve tinyexec error logging and set `throwOnError` to `true` by default
+ */
+export declare function exec(command: string, args?: string[], options?: Partial<Options>): PromiseLike<import("tinyexec").Output>;