Modify user model

[mcab]

We want to add some additional fields to keep track of, tied to each user.

• First name
• Last name
• Email
• Phone number (optional)
• Make username immutable

[mcab]

Resources for this to happen:

• Email and password authentication example with custom user
• Custom user auth + django-allauth over DRF
• Extending the user model
• Login with email not username using django-allauth
• Custom user model
• Customizing authentication in Django (docs)

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Additional fields:

• django-phonenumber-field