* teams: add db migration for email column in teams table

* teams: /teams should render index page with a 200 OK

* teams: additional backend functionality for team and team members

Possibility to save/update email for teams.
Possibility to retrive avatar url when searching for teams.
Possibility to retrive avatar url when searching for team members.

* teams: display team avatar and team member avatars

Possibility to save and update email for a team

* teams: create team on separate page instead of modal dialog