There is now support for a directory /etc/kali-menu/applications. The
purpose of this directory is to allow sysadmin to override the desktop
files that we ship in /usr/share/kali-menu/applications.

For now, the only thing we support is to disable desktop files, by
creating a symlink to /dev/null/.

For example, a sysadmin who wants to disable the desktop-file
kali-maltego-installer.desktop can do so with:

    ln -s /dev/null /etc/kali-menu/applications/kali-maltego-installer.desktop
    update-kali-menu