Use render collection: for rendering shared/featured_news

Make use of the defined counter to provide item-n extra_class stuff too.
Make edition world locations have stronger featuring capabilities

E.g. more like edition organisations.  I think we're calling out for some shared behaviour here.  Problem is we don't want to change urls for existing images.
Copy featured state of world location associations onto new editions
Remove document featuring UI from world_locations#edit page
Provide featuring UI for world locations as standalone page

So it's more like the doucments tab for organisations and the featured items page for topical events.  Borrows heavily from their views / implementations too.
Update world location frontend show page to use new featured items
Features to describe world location featuring workflow