feat: validate school domain for user sign up

[Jaylin0312]

closes #11

Changes

• add school domains as part of environment variables
• add email validation function under src/common/functions
• add email checking in zod email validation on client and server side
• add redirection to verify page after sign up is complete, and before email is verified
• display error message if registered user tries to register again

Implementation

1. We have decided to use a single string to represent the school's email domain rather than an array. Our research indicates that the domain name after the '@' symbol in email addresses remains consistent, regardless of any prefixes. See SMU example.
2. If registered user try to sign up again, supabase api will throw an error, which is caught by the program and error message will be displayed (see supabase create user api)

Testing

To set up the project locally for testing, follow the following steps:

1. Install dependencies yarn install
2. Run the development server yarn dev
3. Head over to user sign up page
4. Fill in valid school emails and password
5. If account creation is successful, you should be redirected to email verification page

Preview

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