Cleaned up audioCard labs flag

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

- removed labs flag and conditionals

ghost/admin/app/services/feature.js

@@ -56,7 +56,6 @@ export default Service.extend({
     mediaAPI: feature('mediaAPI'),
     filesAPI: feature('filesAPI'),
     fileCard: feature('fileCard'),
-    audioCard: feature('audioCard'),
     beforeAfterCard: feature('beforeAfterCard'),
     tweetGridCard: feature('tweetGridCard'),
     headerCard: feature('headerCard'),

ghost/admin/app/templates/settings/labs.hbs

@@ -352,19 +352,6 @@
                         </div>
                     </div>
                 </div>
-                <div class="gh-expandable-block">
-                    <div class="gh-expandable-header">
-                        <div>
-                            <h4 class="gh-expandable-title">Cardmageddon - Audio</h4>
-                            <p class="gh-expandable-description">
-                                Add an audio file
-                            </p>
-                        </div>
-                        <div class="for-switch">
-                           <GhFeatureFlag @flag="audioCard" />
-                        </div>
-                    </div>
-                </div>
                 <div class="gh-expandable-block">
                     <div class="gh-expandable-header">
                         <div>

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

@@ -223,7 +223,6 @@ export const CARD_MENU = [
             matches: ['audio'],
             type: 'card',
             replaceArg: 'audio',
-            isAvailable: 'feature.audioCard',
             payload: {
                 triggerBrowse: true
             }