Implement navigation panel for mobile

Newsfeed

https://design.minds.com/hosted/mobile/michael/mobile%231642-navigation/#artboard1

Notifications

https://design.minds.com/hosted/mobile/michael/mobile%231642-navigation/#artboard8

https://design.minds.com/hosted/mobile/michael/mobile%231642-navigation/#artboard2

This should be behind the same feature flag as the new navigation

Use the existing notification list

• New notification design
• light mode
• dark mode
• unit tests
• e2e tests