Define email as a mandatory field on user registration

[bajiat]

We are using email as a unique identifier for users. Ensure that all users of Apinf must register and validate their email at signup. This includes Github authentication.

Definition of done

• Make sure email is a mandatory field in user profile schema.
• Ensure that user email is collected when users authenticate by any method.
• Send confirmation email to ensure accuracy of user emails.
• To ensure the validity of email address.

[frenchbread]

Related branch - email-is-mandatory

[brylie]

E.g. when a user signs in, check if they have an email address stored in their profile. If no email address is available, prompt for email.

[frenchbread]

Useful info regarding getting an email when authenticating using github