reenabled admin area; outfitted apps.lyric.models w. AbstractBaseUser instead of custom user class; many other fns & several models updated to accomodate, such as set_unusable_password() method to base user model; reset staging db to prepare for refreshed lyric migrations to accomodate for retrofitted pw field

src/apps/lyric/authentication.py

@@ -13,7 +13,7 @@ class PasswordlessAuthenticationBackend:
         try:
             return User.objects.get(email=token.email)
         except User.DoesNotExist:
-            return User.objects.create(email=token.email)
+            return User.objects.create_user(email=token.email)
 
     def get_user(self, user_id):
         try: