allauth: Use allauth for closed signups
allauth: Drop an unused template
allauth: Move the last template to account/
allauth: Remove now-unused EMAIL_SEND_HTML setting
allauth: Use allauth setting for email confirmation expiry
allauth: Drop now-unused password reset urls
allauth: Drop django-registration
allauth: Move pootle_profile urls to /profiles/
allauth: Fix a leftover hardcoded url
allauth: Use accounts/ as the base url for allauth