django 31 update user registration reference

reference:
https://docs.djangoproject.com/en/2.2/topics/auth/default/
https://simpleisbetterthancomplex.com/tutorial/2016/07/22/how-to-extend-django-user-model.html
https://stackoverflow.com/questions/11494483/django-class-based-view-how-do-i-pass-additional-parameters-to-the-as-view-meth
https://docs.djangoproject.com/en/2.2/topics/class-based-views/intro/
https://stackoverflow.com/questions/20171662/django-user-account-update-ignore-user-with-this-username-already-exists
https://simpleisbetterthancomplex.com/tips/2016/08/04/django-tip-9-password-change-form.html