Settings options

There should be a settings.json (e.g.) where settings options can be stored.

For now, there are only a few settings options that are needed:

• whether guest login is allowed for either student or lecturer
• whether the app runs in debug

The settings file needs to be used for both development (locally) and production (built version). There should be 2 default settings files (one for normal production use and one for development). The file needs to be integrated into the CI Pipeline.