Provide stats images for teams/organizations

**Is your feature request related to a problem? Please describe.**
I like the concept of these badges, but would like to encourage teamwork and so providing those for team/organisations would be nice !

**Describe the solution you'd like**
Replace username=login by organisation=id would be nice.

**Describe alternatives you've considered**
Collected all the usernames in a team and had one image for each person.