refs. https://github.com/TryGhost/Team/issues/205
Major update to Ghost Admin UI including:
- improved general consistency (typography, colors and contrast, UI components, icons)
- new design for post and pages lists, improved discoverability of filters
- search moved to modal
- account menu is decoupled from ghost logo
- further usability fixes
no issue
- don't nest details route as it's not nested UI
- implement styled list of members
- add `<MemberAvatar>` component that generates random background colour and initials based on member name
- fixed generation of fake member details in mirage
