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
refs https://github.com/TryGhost/Ghost/issues/8464
- fix padding on user actions button
- match user screen heading to other screens
- match app screen headers to other screens, update form styles
- change header link colour to match non-link colour
- fix team acceptance test
- fix canvas top padding so header elements always align
- reduce header font size
refs https://github.com/TryGhost/Ghost/issues/7865
- updates all settings screens to use EC tasks and `gh-task-button` to get save-state save buttons
- removes now-unused `settings-save` mixin
- moves the order of button color CSS so that grey buttons can change to green/red after completing
- removes the heading from `apps-loading` template so that there's no odd flash when loading slack/amp screens directly
