Remove references to obsolete mailing lists

/reviewed-on !755

bt5/erp5_knowledge_pad/SkinTemplateItem/portal_skins/erp5_gadget/ERP5Site_viewAnonymousDocumentationGadget.zpt

@@ -8,6 +8,7 @@
   <p>Are you using ERP5 in your business? 
      If so please let us know if you would be 
      interested to provide us with some information 
-     by sending an email to erp5-users@erp5.org</p>
+     by posting on <a href="https://www.erp5.com/forum/">ERP5 Forum</a></p>
+
 
 </div>

setup.py

@@ -43,7 +43,6 @@ setup(name=name,
         ],
       url='http://www.erp5.org',
       author='The ERP5 Development Team',
-      author_email='erp5-dev@erp5.org',
       keywords='erp5 utilities',
       license='GPLv3',
       namespace_packages=['erp5', 'erp5.util'],