Remove unused files.

doc/figures/archi.fig

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doc/images/icons/README

-Replaced the plain DocBook XSL admonition icons with Jimmac's DocBook
-icons (http://jimmac.musichall.cz/ikony.php3). I dropped transparency
-from the Jimmac icons to get round MS IE and FOP PNG incompatibilies.
-
-Stuart Rackham