Remove dead symbolic links

for i in `find .`; do if (test -h $i); then file $i|grep broken; fi; done

./es/99book.bib: broken symbolic link to `../en/99book.bib'
./es/bookhtml.cfg: broken symbolic link to `../en/bookhtml.cfg'
./es/fixhtml.py: broken symbolic link to `../en/fixhtml.py'
./es/hgbook.css: broken symbolic link to `../en/hgbook.css'
./es/htlatex.book: broken symbolic link to `../en/htlatex.book'

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/web/robots.txt	Thu May 21 14:26:31 2009 +0800
     1.3 @@ -0,0 +1,2 @@
     1.4 +User-agent: *
     1.5 +Disallow: /feeds/