Add post install autostart script

The following needs to run on the user account, and is currently not handled by the kickstart file:

  wget https://www.zedat.fu-berlin.de/pub/ZEDAT/WLAN/eduroam-linux-eduroam-2019.py
  chmod +x eduroam-linux-eduroam-2019.py
  ./eduroam-linux-eduroam-2019.py

  gnome-extensions enable places-menu@gnome-shell-extensions.gcampax.github.com
  gnome-extensions disable background-logo@fedorahosted.org
  gnome-extensions enable no-overview@fthx
  gnome-extensions enable gsconnect@andyholmes.github.io