_includes/head: add missing font, and switch to preload for all
_includes/head: add missing font, and switch to preload for all

Looks like lighthouse doesn't like prefetch for fonts, so switching
to preload. Also adds a missing variant of Geomanist to the list.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

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