Set up Routing Controls and Logic to Enforce User to Complete Personal Details

[tryyang2001]

• we must enforce the authentication such that only authenticated users can access our services such as viewing the assignment details, and only tutors in charge can create/update questions and view submissions for their students.
• currently, the sign up form in frontend does not ask for user name, major, course, etc. We need some logic to force the user to at least set their name and major before they can start using the services. Then for registering courses, we can either goes with email invitation way, or let the user search the course and join (need tutor approval, maybe). See which one is simpler.