Fork password-reset page to have stanford stuff

This PR forks the password_reset_confirm template to have the Stanford logo and help link.

@jrbl 
Suffice it to say that, in the obtuseness of the code, {{MKTG_URL_ROOT}} is handled differently than {{MKTG_URL_FAQ}}, and the former works on our platform but the latter does not, nor is it easy to set it to an external URL (it actually maps 'FAQ' to named django urlpatterns, not actual URLs).

So I fixed what's fixable (ROOT), and leave the hardcoded value for FAQ.