prepare for 2FA

- add and migrate User fields for 2FA
- add views for 2FA
- add new forms for 2FA
- update package list in requirements.txt
- add URLs for 2FA views

bookwyrm/models/user.py

@@ -175,6 +175,11 @@ class User(OrderedCollectionPageMixin, AbstractUser):
     property_fields = [("following_link", "following")]
     field_tracker = FieldTracker(fields=["name", "avatar"])
 
+    # two factor authentication
+    two_factor_auth = models.BooleanField(default=None, blank=True, null=True)
+    otp_secret = models.CharField(max_length=32, default=None, blank=True, null=True)
+    htop_count = models.IntegerField(default=0, blank=True, null=True)
+
     @property
     def active_follower_requests(self):
         """Follow requests from active users"""