Document changes and release 5.11.11pureos1~amber1 of linux-librem5

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
2 jobs for pureos/amber-phone in 80 minutes and 33 seconds (queued for 11 minutes and 13 seconds)
Status Job ID Name Coverage
  Build
passed #339584
librem5
build:aarch64

00:46:06

passed #339585
librem5:arm64
build:deb

01:08:28