Add route to question carousel for participant

Navigate to new content creation page when clicking on "Create new content"
Make ContentCreation component a component (not a MatDialog)
Add new routes to new pages

Remove unnecassary api call for room to get room id (?!)

Added UserRole enum to enable a generic route guard based on roles.

Add creator home screen component
Add creator home screen route

Add room component
Remove unused room logic from component
Add room route

Remove scss