v0.8.0

Features

• add placeholder participations (#471)
• Design rework: bootstrap 5, scss, colors (#494)
• Design update (#512, #513, #530)
• don't send notifications for own actions, add urls for push notifications (#519)
• refactor SignupStats to use missing and free counts (#511)

Bugfixes

• fix wrong select2 event, fix missing select2 translations (#525)

Other

• fix method naming (#514)
• poetry update (#493)