asylum: Drop Ubuntu Saucy support

Ubuntu Saucy had its EOL today, drop it from the page (but the repo is
kept for a little longer).

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
asylum: Move incubator to its separate component

But the component is always selected when 3.5 is in use, and the release
supports it.

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