MyCroft has a large community that supports and discusses the technology at https://community.mycroft.ai/. It is strongly recommended that the troubleshooting information at this community is used as, at the time of writing, MyCroft is under active development and has both many quirks and many new features. It's also a good place to share skills you build for it.
Seeed Studio, the creaters of the Respeaker 2-Mics HAT host documentation and code for this device, along with bigger four-and six-microphone versions at https://github.com/respeaker/seeed-voicecard.