update demo database

Author: mark-prins

build/windows/demo/local.yaml

@@ -1,13 +1,6 @@
 server:
   port: 8000
   danger_allow_http: true
-sync:
-  url: 'http://localhost:2048'
-  username: ''
-  password_sha256: ''
-  interval_sec: 3600
-  central_server_site_id: 1
-  site_id: 2
 database:
   host: 'localhost'
   port: 5432