app-config: split cors and urls out to separate development config

app-config.yaml

@@ -1,15 +1,11 @@
 app:
   title: Backstage Example App
-  baseUrl: http://localhost:3000
+  baseUrl: http://localhost:7000
 
 backend:
   baseUrl: http://localhost:7000
   listen:
     port: 7000
-  cors:
-    origin: http://localhost:3000
-    methods: [GET, POST, PUT, DELETE]
-    credentials: true
   database:
     client: sqlite3
     connection: ':memory:'