Enabled certificate publishing from command-line

Instead of defining environment variables for
push server URL-s the URL-s are now fetched
from openssl.cnf instead.

README.rst

@@ -154,8 +154,6 @@ Otherwise manually configure ``uwsgi`` application in ``/etc/uwsgi/apps-availabl
     chmod-socket = 660
     chown-socket = certidude:www-data
     buffer-size = 32768
-    env = PUSH_PUBLISH=http://localhost/event/publish/%(channel)s
-    env = PUSH_SUBSCRIBE=http://localhost/event/subscribe/%(channel)s
     env = LANG=C.UTF-8
     env = LC_ALL=C.UTF-8
     env = KRB5_KTNAME=/etc/certidude.keytab
@@ -232,6 +230,11 @@ Also adjust ``/etc/nginx/nginx.conf``:
         include /etc/nginx/sites-enabled/*;
     }
 
+In your CA ssl.cnf make sure Certidude is aware of your nginx setup:
+
+    publish_certificate_url = http://push.example.com/event/publish/%(request_sha1sum)s
+    subscribe_certificate_url = http://push.example.com/event/subscribe/%(request_sha1sum)s
+
 Restart the services:
 
 .. code:: bash