[User Story] Split the entry points for instructor and students

[jody]

Story

As a student and faculty user,
I want a URL directly to my "opening page".
So that I don't accidentally click the wrong button or get confused by the interface.

Acceptance Criteria

• There is a URL that shows only the "student" entry interface.
• There is a URL that shows only the "instructor" entry interface.
• There is a URL that shows an entry interface for both students and instructors.