core/ui.el: Only enable golden-ratio-mode on emacs-snapshot

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
users/algernon[@bombadil]: Use cyberpunk theme in presentation mode

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
users/algernon/s-server.el: Make server-start emacs-snapshot specific

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>