Where to find documentation?
Most of !BMC's documentation should be under the docs/ directory in the repo.
How to ask questions:
!BMC devs may sometimes be found on freenode, in irc://chat.freenode.net/#talos-workstation and irc://chat.freenode.net/#bangbmc
With the issues regarding freenode, many community members have at least established a presence on libera.chat. So irc://irc.libera.chat/#talos-workstation and irc://irc.libera.chat/#bangbmc are also good places to look.
At some point it's likely the community, or most of it, will fully migrate to libera.chat. If/When that happens this page should be updated to note such.