Add "Copy/move queues" to the list of main advantages of Krusader

Add to the list of main advantages of Krusader:

Copy/move queues

as it is a very important feature; we're used to it and so we don't notice how useful it is, although other people do:

https://www.reddit.com/r/kde/comments/gas400/krusader_kdes_powerful_file_manager_is_20_years/fp2mye9/

Differential Revision: https://phabricator.kde.org/D29433