Here is a draft of the website:
http://www.unipress.waw.pl/fityk/xylib/
The website is generated from README file, which is written in reStructuredText:
https://fityk.svn.sourceforge.net/svnroot/fityk/trunk/3rdparty/xylib/README
I'm also thinking about converting fityk manual from DocBook to reST.
Marcin
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Marcin Wojdyr | http://www.unipress.waw.pl/~wojdyr/