it's not used by anywhere else in lbmk, but the release build
script will automatically download each project named as per
file names in config/git/
this is a stupidly simply way to prove documentation in
libreboot releases, and i've used current revisions corresponding
to the Libreboot 20231021 release, for this 20231021 release
of lbmk.
Signed-off-by: Leah Rowe <leah@libreboot.org>