Trac recommends creating tickets to incorrect ticket tracker

When presented with a Trac error, `code.djangoproject.com` says "To that end, you could create a ticket." (see screenshot) with a link to Django's Trac ticket tracker. After using the link to report `code.djangoproject.com` tickets (see https://code.djangoproject.com/ticket/24216) I was told I should instead use https://github.com/django/code.djangoproject.com/issues. I think it would be helpful to update this message to reflect the preferred ticket tracker.