update mailing list references

content/community.txt

@@ -3,7 +3,9 @@ Kwant mailing list
 
 The mailing list kwant-discuss@kwant-project.org serves as the main platform
 for discussion of various aspects of Kwant: reporting bugs, asking questions,
-and discussing furhter development. The mailing list archives are available
-through `gmane <http://gmane.org/gmane.comp.python.kwant.discuss>`_
+and discussing furhter development. You can sign up to the mailing list at its
+`info page <https://mailman-mail5.webfaction.com/listinfo/kwant-discuss>`_. The
+mailing list archives are available through `gmane
+<http://gmane.org/gmane.comp.python.kwant.user>`_.
 
 New releases of Kwant are announced through kwant-announce@kwant-project.org.