v1.0.0+15

Features

• fetch group members
• group owners can delete groups
• basic group invites functionality via email (read/create/delete)

Fixes

• launching web urls in settings 🕸️
• reduce amount of time when fetching groups list endpoint is called
• show offline screen if user is authenticated but fetching groups failed
• don't animate navigation to root page
• speed dial overlay styling 💅
• minor optimizations (migrated to flutter_platform_widgets package, use const, dispose focus nodes)