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

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

.changeset/unlucky-hotels-hammer.md

@@ -0,0 +1,7 @@
+---
+'@backstage/create-app': patch
+---
+
+Removed the `react-router` dependency from the app package, using only `react-router-dom` instead.
+
+This change is just a bit of cleanup and is optional. If you want to apply it to your app, remove the `react-router` dependency from `packages/app/package.json`, and replace any imports from `react-router` with `react-router-dom` instead.

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,