fix: rename session cookie -> steering_sessionid

steering/settings.py

@@ -131,6 +131,8 @@ INSTALLED_APPS = (
 
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 
+SESSION_COOKIE_NAME = "steering_sessionid"
+
 # When generating schedules/timeslots:
 # If last_date wasn't set manually, add timeslots until these number of days after the start_date
 AUTO_SET_LAST_DATE_TO_DAYS_IN_FUTURE = 365