Blog about new `diagram-js@11` release (popup menu rework)

[nikku]

Closes https://github.com/bpmn-io/bpmn-js/issues/1780

[smbea]

Some comments:

• It has now been included and released in dmn-js@14 too, maybe we can mention that
• Do we want to show how it looks outside of the replace menu, like in the align/distribute? Since it's something that affects all popup menus, could be interesting to look at more than one use case

[nikku]

@smbea Incorporated review hints via https://github.com/bpmn-io/bpmn.io/pull/152/commits/d7884898318210be48daf1083710a3d5e1196e07.