doc updates

ISSUES: note images are considered spam as well as HTML.

Links: Clarify we may only endorse the Free versions of nginx, not the
non-Free versions.

Add a link to Starman as a unicorn derivative, as I even use Starman
myself.  Remove yahns, since it's really the complete opposite of
unicorn and probably not appropriate to place next to Starman and
gunicorn

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