Feature: Verification emails

When you create an account, an email with the verification code gets sent.

You are redirected to a verification page, where you can enter the code, submit and your account gets marked as verified.

The page after verification is not implemented.

To do this, I:

1. Added a hidden input to the code input that contains the actual value
2. Set up mail sending using AWS SES (over SMTP)
3. Added a flags column to users, and created a flagset with a verified and admin flag
4. Created verification sessions, which store the code, an expiry date and a unique identifier

Next, I’ll implement signing in (with sessions)

• Commit 1 - hidden input
• Commit 2 - verification sessions, emails and flags