docs: update Sbroad section with more details

See merge request picodata/picodata/docs!51

docs: roll in Sbroad decription

See merge request picodata/picodata/docs!50

docs: pull clustering.md back in

See merge request picodata/picodata/docs!49

docs: update Picodata description part

See merge request picodata/picodata/docs!48

docs: add tests description

See merge request picodata/picodata/docs!47

docs: update PDF set after review

See merge request picodata/picodata/docs!46

docs: update PDF set

See merge request picodata/picodata/docs!45

docs: update site and product description

See merge request picodata/picodata/docs!44

docs: added user manual PDF

See merge request picodata/picodata/docs!43

docs: added install guide in PDF

See merge request picodata/picodata/docs!42

docs: fix discovered typos

See merge request picodata/picodata/docs!41

feat: expel node

See merge request picodata/picodata/docs!40

docs: fix typos and minor flaws

See merge request picodata/picodata/docs!39

docs: update structure, add compilation steps

See merge request picodata/picodata/docs!38

docs: complement instance-id description

See merge request picodata/picodata/docs!37

docs: mention CentOS 8 support

See merge request picodata/picodata/docs!36

docs: update download info in install.md

See merge request picodata/picodata/docs!35

Fix

See merge request picodata/picodata/docs!34

docs: revise install.md

See merge request picodata/picodata/docs!33

docs: update materials for the new release

See merge request picodata/picodata/docs!32