_scss: tweak white-space / margins
_scss: tweak white-space / margins

- Reduce white-space after headings, so that the section content groups
  better with the heading
- Increase white-space before headings, so that sections are more separated
  from the previous sections.
- Reduce indentation of bullet-lists and numbered-lists. These lists are
  still indented slightly (5px), but reducing the indentation to make the
  layout a bit less "busy", and to give list-items slightly more width
  before content is wrapped.

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

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