no issue
- since `ember-concurrency@2.0` it's possible to use the standard imports as decorators removing the need for the extra `ember-concurrency-decorators` dependency and imports
refs https://github.com/TryGhost/Team/issues/1149
- use ember-keyboard's `{{on-key}}` modifier to attach keyboard event listener when the design settings index screen is shown - ensures that ctrl/cmd+s on the change-theme screen won't trigger an unexpected save
- blur active element when saving so the preview is updated and reflects what has just been saved (text fields only update preview on blur)
no issue
- ensured that we're only swapping classes on existing elements or inserting/removing elements around the iframe to avoid re-rendering and the associated loading+layout flash
refs https://github.com/TryGhost/Team/issues/1130
- when moving the design settings screen from a modal to normal routes the save process was misplaced and the template not updated
- moved all the design settings behaviour over to the index controller where it belongs and updated the template to use `this.saveTask` rather than `@data.saveTask` as was used in the modal
refs https://github.com/TryGhost/Team/issues/1130
- added `ui.contextualNavMenu` property that when set will switch the main nav menu between components, if it's not set then it will show the default "main" menu component
- added `design` menu sub-component of `gh-nav-menu` ready for use via `contextualNavMenu`
- moved sidebar contents from the design modal into this component
- updated design route to set/reset `ui.contextualNavMenu` to `design` on entering/leaving the route
- all other design routes are sub-routes so this works across all other design screens
- moved base design modal preview into the `settings/design/index` controller/template
- using index means that it's the default screen for `/settings/design` but will be automatically replaced by any other `design.x` routes
- moved `design/advanced` modal content into the `settings.design.advanced` controller/template and removed the modal handling from the route
