Remove :register APIs for student and teacher

[sudheshna-donthineni]

Now, db-service handles the creation of a new student/teacher. It first checks if the student/teacher already exists, if yes, then updates the student/teacher (along with user), otherwise creates a student/teacher (along with user).
Since student and teacher are coupled with user, any updating of student and teacher should also update the user.

[Bahugunajii]

Similarly, for update and delete functions, we will be using update_student_with_user and delete_student_with_user.

Let's make these slight changes!

[sudheshna-donthineni]

Similarly, for update and delete functions, we will be using update_student_with_user and delete_student_with_user.

Let's make these slight changes!

update_student_with_user is already implemented. We technically don't want to have deletion functionality.

[Bahugunajii]

Similarly, for update and delete functions, we will be using update_student_with_user and delete_student_with_user.
Let's make these slight changes!

update_student_with_user is already implemented. We technically don't want to have deletion functionality.

What I'm trying to say is, we have a PATCH /student API and the fucntion definition looks like:

  def update(conn, params) do
    student = Users.get_student!(params["id"])

    with {:ok, %Student{} = student} <- Users.update_student(student, params) do
      render(conn, "show.json", student: student)
    end
  end

So instead of updating only the student here, we can change it to update student along with the user!