docs: user form (#931)

docs/installation/auth.md

@@ -8,7 +8,7 @@ description: User & group models configuration
 
 By default, when `django.contrib.auth` is in `INSTALLED_APPS`, you are going to have user and group models in admin. Both models are going to work but they will look unstyled because they are not inheriting from `unfold.admin.ModelAdmin`.
 
-The solution is to unregister default admin classes and then register them back by using `unfold.admin.ModelAdmin` like in the example below
+The solution is to unregister default admin classes and then register them back by using `unfold.admin.ModelAdmin` like in the example below. Additionally, we have to override default user forms (`UserAdmin` class) which are by default loaded by Django admin. New, overridden forms are going to have proper styling.
 
 ```python
 # admin.py
@@ -18,6 +18,7 @@ from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
 from django.contrib.auth.admin import GroupAdmin as BaseGroupAdmin
 from django.contrib.auth.models import User, Group
 
+from unfold.forms import AdminPasswordChangeForm, UserChangeForm, UserCreationForm
 from unfold.admin import ModelAdmin
 
 
@@ -27,7 +28,10 @@ admin.site.unregister(Group)
 
 @admin.register(User)
 class UserAdmin(BaseUserAdmin, ModelAdmin):
-    pass
+    # Forms loaded from `unfold.forms`
+    form = UserChangeForm
+    add_form = UserCreationForm
+    change_password_form = AdminPasswordChangeForm
 
 
 @admin.register(Group)