Docs are included in the distribution package in HTML form and are posted at <http://srcds.info/>. The content is very beginner focused. The source docs are written in ReStructedText format and any additions are welcome. There are many topics of administrating dedicated servers which need up-to-date detailed instructions.
Known BUGS: There was a FATAL syntax error with bash 4 prior to V42. Please report any issues and tell which shell is being used & it's version.