jekyll: fix not expanded DOMAIN env
jekyll: fix not expanded DOMAIN env

Signed-off-by: CrazyMax <2eb8101acbc78c0d8bc50c0413737c84f1fc3bdc@users.noreply.github.com>

docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io