[Clipart] public domain links

[Jeremy C. Reed]

The public domain links on the browsing webpages go to
http://web.resource.org/cc/PublicDomain (which appears to have no content
about it)  and http://creativecommons.org/licenses/publicdomain/.

It seems better to just have the link for explaining public domain go to
our own wiki webpage about the licensing.

Also, it is nice that it says public domain, but is this superfluous?
Would we ever have clipart provided that is not public domain? Each
clipart item doesn't need to restate it since the bottom already says "The
clipart downloads on this site are dedicated to the Public Domain."

 Jeremy C. Reed

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