no issue
- ran the `ember-native-class-codemod` codemod to convert just the route classes to native class syntax and performed some minor manual cleanup
- modern Ember uses native classes rather than EmberObject-based objects, this brings us closer to normalizing our code style across the codebase
- skipped the Application route as that requires deeper testing with a replacement for the `ShortcutsRoute` mixin
no issue
- moved `document-title` Route extension's functionality into the `ui` service
- updates the title each time the router service emits a route changed event
- `ui.updateDocumentTitle()` can now be called directly from components rather than the confusing `this.send('updateDocumentTitle')` bubbling behaviour
- refactored the `titleToken` implementation to use the now-formalised `RouteInfo`'s `metadata` field (https://github.com/emberjs/rfcs/blob/master/text/0398-RouteInfo-Metadata.md#appendix-a)
no issue
- added `page` model
- removed `page` param from Post model
- added pages screen with associated links
- added `:type` param to editor screens to work with the right models
- removed post<->page toggle and associated tour item
