We are still working on the Librem-specific integration so I haven’t written those docs yet as we are still finalizing how the workflows will look. For instance, for LUKS integration we are working to add OpenPGP smartcard support in Debian upstream: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903163
For Heads integration, we are starting up a small beta program for advanced users who are interested in trying it out but aren’t afraid of compiling coreboot and flashing their BIOS.
I hope to have at least some public docs for the things that are somewhat finalized on our site soon.