Parent modules are exposed to submodules using their base class instead of
concepts, since using concepts is not possible to create a second level nested
modules.
Initial structure for MainModule containing ChatSectionModule and
CommunitySectionModule is added, as well as initial structure for
StartupModule containing OnboardingModule and LoginModule.
Order of execution is updated and adapted to the current app state.
Main module gets loaded once a user is successfully logged in.
