I am trying to implement a ctrlX app that needs some configuration settings. As far as I can tell this is done by defining an appropriate entry in `menus.settings` in the `package-manifest.json` file, which includes the definition of an HTTP endpoint that needs to be implemented in the app. The documentation shows a few code snippets and mentions an `angular.json` file.
Are my assumptions correct? If so, is there a recommended framework to use to implement the app endpoints? If so, are there any example implementations? If not, are there any CSS stylesheets to have a consistent UI matching the ctrlX CORE UI?