chore(techdocs-cli): add backstage app defaults

Signed-off-by: Camila Belo <camilaibs@gmail.com>

packages/embedded-techdocs-app/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "bundled": true,
   "dependencies": {
+    "@backstage/app-defaults": "^0.1.0",
     "@backstage/catalog-model": "^0.9.5",
     "@backstage/cli": "^0.8.0",
     "@backstage/config": "^0.1.10",

packages/embedded-techdocs-app/src/App.tsx

@@ -16,7 +16,8 @@
 
 import React from 'react';
 import { Navigate, Route } from 'react-router';
-import { createApp, FlatRoutes } from '@backstage/core-app-api';
+import { createApp } from '@backstage/app-defaults';
+import { FlatRoutes } from '@backstage/core-app-api';
 import { CatalogEntityPage } from '@backstage/plugin-catalog';
 
 import {