Update README to clarify Galaxy Server role a bit better
Update README to clarify Galaxy Server role a bit better

IntersectAustralia/galaxy-cloudman-playbook,AAFC-MBB/galaxy-cloudman-playbook,AAFC-MBB/galaxy-cloudman-playbook,IntersectAustralia/galaxy-cloudman-playbook,IntersectAustralia/galaxy-cloudman-playbook,AAFC-MBB/galaxy-cloudman-playbook