[gnome-apps-nightly] Remove migrated apps

[Jordan Petridis <jpetridis src gnome org>]

commit e0e450c0eb6974f79f12f4b19408e32c397072bf
Author: Jordan Petridis <jpetridis gnome org>
Date:   Mon Sep 30 14:23:55 2019 +0300

    Remove migrated apps
    
    We now build nightlies directly from the Gitlab CI, and they are pushed
    to a new repository:
    
    https://mail.gnome.org/archives/desktop-devel-list/2019-September/msg00028.html
    
    Not all apps were migrated though so we haven't decommissioned this
    repository yet.
    
    This commit removes those apps which have already been migrated to the
    new way of doing things, so that we don't continue building them here
    for nothing.

 org.gnome.Fractal.app       | 3 ---
 org.gnome.Music.app         | 3 ---
 org.gnome.NautilusDevel.app | 3 ---
 3 files changed, 9 deletions(-)