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

node_modules/hast-util-whitespace/lib/index.d.ts

@@ -0,0 +1,13 @@
+/**
+ * Check if the given value is *inter-element whitespace*.
+ *
+ * @param {Nodes | string} thing
+ *   Thing to check (`Node` or `string`).
+ * @returns {boolean}
+ *   Whether the `value` is inter-element whitespace (`boolean`): consisting of
+ *   zero or more of space, tab (`\t`), line feed (`\n`), carriage return
+ *   (`\r`), or form feed (`\f`); if a node is passed it must be a `Text` node,
+ *   whose `value` field is checked.
+ */
+export function whitespace(thing: Nodes | string): boolean;
+export type Nodes = import('hast').Nodes;