Guido Gunther authored Apr 25, 2020 and Sebastian Krzyszkowiak committed Apr 26, 2020

While one can run with `gnome-session ...` this needs a compositor
running so rather explain how to use a display manger and how
to start from a text console and how it works.

Also the override file got simpler with
babbd8d6

Signed-off-by: Guido Günther <guido.gunther@puri.sm>