update: classes for avatar, logo and flex added + css for elements from main header are outside the styles for that header

Calum Mackervoy authored 5 years ago and Gaëlle Morin committed 5 years ago

- CSS added
- architecture reworked
- new field 'is-admin' used
- members field used instead of team field.

- New styles for "add users" drodown
- New custom widget to display members
- Use of the permission system