The second section of doc links is aimed at operators, so existing
content which affects operators has been moved here (package based
install, scaling, service man pages).
The yum/apt install pages have been simplified to point at
docs.openstack.org and any other community based installation resources
(RDO, Juju charms).
Change-Id: I3e89a288bf6b64ba286c11df1369e073d2c2a35e