text: Title: Settings improvement
  Body: - [x] rewrite app.config to get settings from database (overwritting)
  - [x] remove the code that updates settings on Config.save()
  - [x] add app factory to create_minimum_app (for context)
  - [x] Make quokka.utils.lazy_setting to use with create_minumum_app().app_context() to allow the use in models
  