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doc/start: Improve beginners-guide.rst
doc/start/ceph.conf: trim the sample ceph.conf file
doc/start: Clarify doc building and begin list of conventions
doc/start: Update and fix get-involved.rst
docs/start: Reflect multi-arch support for SMB service
doc/start: Mention RGW in Intro to Ceph
doc: Remove SysVinit/upstart references from user-facing docs
doc: remove references to ceph-deploy