allow both routes to a doi

apps/doi-landing-page/src/routes.tsx

@@ -3,16 +3,17 @@ import { LandingPage } from 'landingPage/LandingPage';
 import type { RouteObject } from 'react-router-dom';
 import { PageNotFound } from 'routing/PageNotFound';
 
+const DOI_ROUTE = {
+  path: `:${DOI_PREFIX_PARAM}/:${DOI_SUFFIX_PARAM}`,
+  element: <LandingPage />,
+};
+
 export const routes: RouteObject[] = [
   {
     path: 'doi',
-    children: [
-      {
-        path: `:${DOI_PREFIX_PARAM}/:${DOI_SUFFIX_PARAM}`,
-        element: <LandingPage />,
-      },
-    ],
+    children: [DOI_ROUTE],
   },
+  DOI_ROUTE,
   {
     path: '*',
     element: <PageNotFound />,