v18.2.6
doc/start: add vstart install guide
doc/start/ceph.conf: trim the sample ceph.conf file
doc: s/Whereas,/Although/
doc/start: update mailing list links
doc: Fixes a typo in controllers section of hardware recommendations
doc/start: Mention RGW in Intro to Ceph
doc/start: separate package and container support tables
doc: remove references to ceph-deploy