Comments: Added wysiwyg link selector, updated tests, removed command

- Updated existing tests with recent back-end changes, mainly to use
  HTML data.
- Removed old comment regen command that's no longer required.

database/factories/Activity/Models/CommentFactory.php

@@ -27,6 +27,7 @@ class CommentFactory extends Factory
             'html'      => $html,
             'text'      => $text,
             'parent_id' => null,
+            'local_id'  => 1,
         ];
     }
 }