List of available {[project]} user guides.

{[os-debian-title]} / PostgreSQL {[os-debian-pg-version-min]}-{[os-debian-pg-version-max]} {[os-centos-title]} / PostgreSQL {[os-centos8-pg-version-min]}-{[os-centos8-pg-version-max]} {[os-centos-title]} / PostgreSQL {[os-centos7-pg-version-min]}-{[os-centos7-pg-version-max]}