Added fix links in newsletter feature flag

refs https://github.com/TryGhost/Team/issues/2063

ghost/admin/app/services/feature.js

@@ -67,6 +67,7 @@ export default class FeatureService extends Service {
     @feature('lexicalEditor') lexicalEditor;
     @feature('exploreApp') exploreApp;
     @feature('audienceFeedback') audienceFeedback;
+    @feature('fixNewsletterLinks') fixNewsletterLinks;
 
     _user = null;
 

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

@@ -284,6 +284,19 @@
                         </div>
                     </div>
                 </div>
+                <div class="gh-expandable-block">
+                    <div class="gh-expandable-header">
+                        <div>
+                            <h4 class="gh-expandable-title">Fix newsletter links</h4>
+                            <p class="gh-expandable-description">
+                               Allow publishers to edit newsletter links after sending.
+                            </p>
+                        </div>
+                        <div class="for-switch">
+                           <GhFeatureFlag @flag="fixNewsletterLinks" />
+                        </div>
+                    </div>
+                </div>
             </div>
         </div>
         {{/if}}

ghost/core/core/shared/labs.js

@@ -35,7 +35,8 @@ const ALPHA_FEATURES = [
     'sourceAttribution',
     'lexicalEditor',
     'exploreApp',
-    'audienceFeedback'
+    'audienceFeedback',
+    'fixNewsletterLinks'
 ];
 
 module.exports.GA_KEYS = [...GA_FEATURES];