Slides are alwas requested cross domain in a cluster setup. There is no
authentication required for the slides, so we can just allow requests
from anywhere.
Co-authored-by: Daniel Schreiber <daniel.schreiber@hrz.tu-chemnitz.de>
To ease setup some changes required in the nginx config for load
balancer setup are prepared here. They do not harm non-loadbalancer setups.
The changes in the system startup scripts are mandatory
