Team (circle) overview page

[juliusknorr]

From nextcloud/server#42433

• Simplify UI to hide advanced settings
• member list goes into a modal
• Sorting members by owner/admin/member
• Circles membership modal can be reused
• List all resources that are shared with the team (circle) depends on API for teams server#43683

Stretch goal

• Add option to share a new entry to the circle