Added all official themes to the new change theme screen

no issue

- added details to the `marketplaceThemes` array in the `change-theme` controller
- added theme images obtained from https://ghost.org/themes/

ghost/admin/app/controllers/settings/design/change-theme.js

@@ -11,37 +11,103 @@ export default class ChangeThemeController extends Controller {
     @tracked themes = this.store.peekAll('theme');
 
     marketplaceThemes = [{
+        name: 'Journal',
+        category: 'Newsletter',
+        url: 'https://github.com/TryGhost/Journal',
+        previewUrl: 'https://journal.ghost.io/',
+        ref: 'TryGhost/Journal',
+        image: 'assets/img/themes/Journal.png'
+    }, {
         name: 'Edition',
         category: 'Newsletter',
         url: 'https://github.com/TryGhost/Edition',
         previewUrl: 'https://edition.ghost.io/',
         ref: 'TryGhost/Edition',
-        image: 'assets/img/themes/Edition.jpg',
-        shortImage: 'assets/img/themes/Edition-cut.jpg'
+        image: 'assets/img/themes/Edition.png'
+    }, {
+        name: 'Digest',
+        category: 'Newsletter',
+        url: 'https://github.com/TryGhost/Digest',
+        previewUrl: 'https://digest.ghost.io/',
+        ref: 'TryGhost/Digest',
+        image: 'assets/img/themes/Digest.png'
+    }, {
+        name: 'Bulletin',
+        category: 'Newsletter',
+        url: 'https://github.com/TryGhost/Bulletin',
+        previewUrl: 'https://bulletin.ghost.io/',
+        ref: 'TryGhost/Bulletin',
+        image: 'assets/img/themes/Bulletin.png'
+    }, {
+        name: 'Dawn',
+        category: 'Newsletter',
+        url: 'https://github.com/TryGhost/Dawn',
+        previewUrl: 'https://dawn.ghost.io/',
+        ref: 'TryGhost/Dawn',
+        image: 'assets/img/themes/Dawn.png'
     }, {
         name: 'Alto',
         category: 'Blog',
         url: 'https://github.com/TryGhost/Alto',
         previewUrl: 'https://alto.ghost.io',
         ref: 'TryGhost/Alto',
-        image: 'assets/img/themes/Alto.jpg',
-        shortImage: 'assets/img/themes/Alto-cut.jpg'
+        image: 'assets/img/themes/Alto.png'
     }, {
-        name: 'London',
+        name: 'Edge',
         category: 'Photography',
-        url: 'https://github.com/TryGhost/London',
-        previewUrl: 'https://london.ghost.io',
-        ref: 'TryGhost/London',
-        image: 'assets/img/themes/London.jpg',
-        shortImage: 'assets/img/themes/London-cut.jpg'
+        url: 'https://github.com/TryGhost/Edge',
+        previewUrl: 'https://edge.ghost.io',
+        ref: 'TryGhost/Edge',
+        image: 'assets/img/themes/Edge.png'
     }, {
         name: 'Ease',
         category: 'Documentation',
         url: 'https://github.com/TryGhost/Ease',
         previewUrl: 'https://ease.ghost.io',
         ref: 'TryGhost/Ease',
-        image: 'assets/img/themes/Ease.jpg',
-        shortImage: 'assets/img/themes/Ease-cut.jpg'
+        image: 'assets/img/themes/Ease.png'
+    }, {
+        name: 'Ruby',
+        category: 'Magazine',
+        url: 'https://github.com/TryGhost/Ruby',
+        previewUrl: 'https://ruby.ghost.io',
+        ref: 'TryGhost/Ruby',
+        image: 'assets/img/themes/Ruby.png'
+    }, {
+        name: 'Dope',
+        category: 'Magazine',
+        url: 'https://github.com/TryGhost/Dope',
+        previewUrl: 'https://dope.ghost.io',
+        ref: 'TryGhost/Dope',
+        image: 'assets/img/themes/Dope.png'
+    }, {
+        name: 'Wave',
+        category: 'Podcast',
+        url: 'https://github.com/TryGhost/Wave',
+        previewUrl: 'https://wave.ghost.io',
+        ref: 'TryGhost/Wave',
+        image: 'assets/img/themes/Wave.png'
+    }, {
+        name: 'London',
+        category: 'Photography',
+        url: 'https://github.com/TryGhost/London',
+        previewUrl: 'https://london.ghost.io',
+        ref: 'TryGhost/London',
+        image: 'assets/img/themes/London.jpg'
+    }, {
+        name: 'Editorial',
+        category: 'Magazine',
+        url: 'https://github.com/TryGhost/Editorial',
+        previewUrl: 'https://editorial.ghost.io',
+        ref: 'TryGhost/Editorial',
+        image: 'assets/img/themes/Editorial.jpg'
+    }, {
+        name: 'Massively',
+        category: 'Magazine',
+        url: 'https://github.com/TryGhost/Massively',
+        previewUrl: 'https://massively.ghost.io',
+        ref: 'TryGhost/Massively',
+        image: 'assets/img/themes/Massively.jpg'
     }]
 
     @action