[Front-end] Navigate to a new page to notify "Registration successful" after registering the form

[qingquan-li]

Let users know that they registered successfully to avoid users from re-registering (registering multiple times).

[Lin1404]

I think we can do it in this way:

Add a "registed students" column in DB of Meetings Table to store the registed students' id. When FE send
GET /api/v1/meetings/:id/
for meeting detail, payload includes "registed students". Then FE can check the form, if student's id in the column(array) already, don't submit form, show alert.