Added non-functional themes table to advanced theme settings modal

refs https://github.com/TryGhost/Team/issues/1045

- prep for use in static design
- useful for inspecting API output when querying themes

ghost/admin/app/components/modals/design/advanced.hbs

@@ -5,9 +5,14 @@
     <button type="button" class="close" title="Close" {{on "click" @close}}>{{svg-jar "close"}}<span class="hidden">Close</span></button>
 
     <div class="modal-body">
-    </div>
+        <div class="gh-setting-header">Installed Themes</div>
-
+        <div class="gh-themes-container">
-    <div class="modal-footer">
 
+            <GhThemeTable
+                @themes={{this.themes}}
+                @activateTheme={{optional this.noop}}
+                @downloadTheme={{optional this.noop}}
+                @deleteTheme={{optional this.noop}} />
+        </div>
     </div>
 </div>

ghost/admin/app/components/modals/design/advanced.js

@@ -0,0 +1,10 @@
+import Component from '@glimmer/component';
+import {inject as service} from '@ember/service';
+
+export default class ModalsDesignAdvancedComponent extends Component {
+    @service store;
+
+    get themes() {
+        return this.store.peekAll('theme');
+    }
+}

ghost/admin/app/routes/settings/design/advanced.js

@@ -5,6 +5,7 @@ import {inject as service} from '@ember/service';
 export default class SettingsDesignAdvancedRoute extends AuthenticatedRoute {
     @service feature;
     @service modals;
+    @service store;
 
     beforeModel() {
         super.beforeModel(...arguments);
@@ -16,6 +17,8 @@ export default class SettingsDesignAdvancedRoute extends AuthenticatedRoute {
         if (!this.feature.customThemeSettings) {
             return this.transitionTo('settings');
         }
+
+        this.store.findAll('theme');
     }
 
     activate() {