fix link to docs, add info about mailinglists, change contact info

uffd/selfservice/templates/selfservice/newuser.mail.txt

@@ -5,7 +5,8 @@ password: {{ url_for('selfservice.token_password', token=token, _external=True)
 
 **The link is valid for 48h**
 
-You can find more information at https://docs.cccv.de/.
+If you were granted access to crews or orbits you have been automatically subscribed to the corresponding mailinglists.
+Please find and read the documentation for all services you are granted access to at https://sso.cccv.de/services/.
 
-If you have no idea why someone would create an account for you to be used for the next CCC event organization, please
-contact the infra team at it@cccv.de.
+If you have no idea why someone would create an account for you to be used for the next CCC event organization or have
+other questions, please contact the infra team at it@cccv.de.