v21.1.0
doc/radosgw: update QAT acceleration to specify the configuration
doc/install: Linkify mention of ceph.conf and use ref for links
doc/install: update "Official Releases" sources
doc: update canonical tarballs URL
doc: remove references to ceph-deploy
doc: use plantweb as fallback of sphinx-ditaa
doc: add ceph.conf in osd creation
doc/install: Small improvements in manual-freebsd-deployment.rst
doc: Remove inactive Ceph mirrors.
doc: reorganize Windows docs
doc: Fix a Sphinx warning&error and use labels for links in 4 files
doc,man: typos found by codespell