Revert "Add link to PyPM package"

This reverts commit 4a600f3.

I prefer not to have this link until we’re very confident that the
package actually works. The hard part in packaging WeasyPrint is with
pycairo, PyGObject 3, and Pango with introspection; not the Python
stuff. PyPM does not list non-Python dependencies and does not seem to
have packages for them.

pages/install.rst

@@ -23,14 +23,11 @@ WeasyPrint has been packaged for some Linux distributions:
   as ``weasyprint2``).
 * Gentoo: in the `Kozea overlay`_
 
-WeasyPrint is also packaged for `PyPM`_.
-
 (Please do `tell us`_ if you make such a package!)
 
 .. _python-weasyprint: https://aur.archlinux.org/packages.php?ID=57205
 .. _python2-weasyprint: https://aur.archlinux.org/packages.php?ID=57201
 .. _Kozea overlay: https://github.com/Kozea/Overlay/blob/master/README
-.. _PyPM: http://code.activestate.com/pypm/weasyprint/
 .. _tell us: /community/