Merge branch 'feature/ISTWCMS-4803-ibiki-media-embed' into '1.0.x'

ISTWCMS-4803: Removing dependency from mathjax ckeditor plugin.

See merge request !175

src/Plugin/CKEditorPlugin/MathJaxPlugin.php

@@ -57,7 +57,6 @@ class MathJaxPlugin extends CKEditorPluginBase implements ContainerFactoryPlugin
       'clipboard',
       'dialog',
       'lineutils',
-      'widget',
     ];
   }