[GNC] create desktop icons for GNC 4.9 Flatpak on Ubuntu

[Jeff]

I have never had a problem creating desktop icons for multiple books for 
GNC on Ubuntu 20.04 LTS prior to installing the FlatPak version for GNC 4.9.

Everything I have tried for the desktop icon has failed miserably on the 
Flatpak version of GNC 4.9.  Is there someone who can guide me on 
creating the desktop icons for this version on Ubuntu version 20.04 
LTS.  I have multiple sets of books to maintain for family members.

-- 
--JEffrey Black M.B.A.