Cleaned up accordionCard labs flag

refs https://github.com/TryGhost/Team/issues/1258

- removed labs flag and conditionals

ghost/admin/app/services/feature.js

@@ -55,7 +55,6 @@ export default Service.extend({
     urlCache: feature('urlCache'),
     mediaAPI: feature('mediaAPI'),
     filesAPI: feature('filesAPI'),
-    accordionCard: feature('accordionCard'),
     fileCard: feature('fileCard'),
     audioCard: feature('audioCard'),
     productCard: feature('productCard'),

ghost/admin/lib/koenig-editor/addon/options/cards.js

@@ -203,8 +203,7 @@ export const CARD_MENU = [
             desc: 'Add collapsible content',
             matches: ['toggle'],
             type: 'card',
-            replaceArg: 'toggle',
-            isAvailable: 'feature.accordionCard'
+            replaceArg: 'toggle'
         },
         {
             label: 'Video',