Team management page

[dellisd]

Build a page that allows hackers to manage their team, i.e. inviting new team members, and giving the team a name. This page should double as the team "creation" page.

• When the team is being created, a name should be entered in by the user.
• After creation, any member of the team should be able to change the name of the team
• Once a team has been created the user can invite other members to the team by entering/searching for their username.
• All pending invites should be shown on the team page
• Once a user accepts an invite, they should be shown as a member of the team
• A user should have the option to leave the team, shown as a button, with a confirmation dialog to ensure they mean to leave the team