Store email for each user

[Joe Kennedy]

The application is already capable of storing emails on the database level.

For existing users, we can grab it from one of their teams.

For new users, we probably want to first grab the email from the OAuth login if we can. Otherwise, if they are signing up to join a team, we can grab it straight from the team. However, if they're creating a league, we won't be able to grab it automatically. So we could make a form for email and put it in somewhere in the league setup process