Documentation is organized in different sections :
In french In english (very partial, only development informations)
Users related documentation (from beginners to sysadmin), documentation about the code, about customization and about community
This doc is available at ?doc url : https://mywiki.com/?doc
Technical description each yeswiki actions (parameters, values etc..).
Those files are also used by the action-builder UI to help users creating/updating actions