Restructure async route code

src/routes/asyncRoutes/index.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+import { Route } from 'react-router-dom';
+
+import AsyncPage from '../../components/AsyncPage';
+
+export interface AsyncRoute {
+    /** The URL path for this route. */
+    path: string
+    /** The relative path to the page component in the routes directory. */
+    page: string
+}
+
+export const toAsyncPageRoute = (route: AsyncRoute) => (
+    <Route
+        key={route.path}
+        path={route.path}
+        element={<AsyncPage page={route.page} />}
+    />
+);