landing-page: fix font size
landing-page: fix font size

Signed-off-by: Jérémie Drouet <6b12ef5b67f67346cb6871ff9782da8f71d5657f@gmail.com>

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