* Remove scenes from the main menu
* Remove scenes from the profile view
* Remove 'scenes explainer' from onboarding flow
* Remove scene-related modals
* Remove member/membership code
* Remove all scenes-related items from notifications
* Remove scene-related code from posts feed
* Remove scene-related API helpers
* Update tests
* Add theming system
* Add standard Button control and update RadioButtons
* Unify radiobutton with design system
* Update debug screen to have multiple views
* Add ToggleButton
* Update error controls to use design system
* Add typography to <Text> element
* Move DropdownButton into the design system
* Clean out old code
* Move Text into design system
* Add 'inverted' color palette
* Move LoadingPlaceholder into the design system
* Flatten all routing into a single stack
* Replace router with custom implementation
* Add shell header and titles
* Add tab selector
* Add back/forward history menus on longpress
* Fix: don't modify state during render
* Add refresh() to navigation and reroute navigations to the current location to refresh instead of add to history
* Cache screens during navigation to maintain scroll position and improve load-time for renders
