create-app: update template to only depend on react-router-dom

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/create-app/templates/default-app/packages/app/package.json.hbs

@@ -48,7 +48,6 @@
     "history": "^5.0.0",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
-    "react-router": "^6.3.0",
     "react-router-dom": "^6.3.0",
     "react-use": "^17.2.4"
   },

packages/create-app/templates/default-app/packages/app/src/App.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { Navigate, Route } from 'react-router';
+import { Navigate, Route } from 'react-router-dom';
 import { apiDocsPlugin, ApiExplorerPage } from '@backstage/plugin-api-docs';
 import {
   CatalogEntityPage,