Add non-Angular-friendly email templates to the `ui` folder

[adam-thomas]

The email templates have a #/ in the /register/verify URL, which is a bit awkward. We could use having alternate templates in the ui folder that don't have the #/ in.

[meshy]

what's more, they should probably be the default

[adam-thomas]

possibly! I think it just depends on which one you put in INSTALLED_APPS.