Add global help URL to login template

tailbone/views/auth.py

@@ -37,6 +37,7 @@ from tailbone import forms
 from tailbone.db import Session
 from tailbone.views import View
 from tailbone.auth import login_user, logout_user
+from tailbone.config import global_help_url
 
 
 class UserLogin(colander.MappingSchema):
@@ -128,6 +129,7 @@ class AuthenticationView(View):
             'referrer': referrer,
             'image_url': image_url,
             'use_buefy': use_buefy,
+            'help_url': global_help_url(self.rattail_config),
         }
 
     def authenticate_user(self, username, password):