replace drf by django-ninja

core/schemas.py

@@ -0,0 +1,15 @@
+from ninja import ModelSchema, Schema
+
+from core.models import User
+
+
+class SimpleUserSchema(ModelSchema):
+    """A schema with the minimum amount of information to represent a user."""
+
+    class Meta:
+        model = User
+        fields = ["id", "nick_name", "first_name", "last_name"]
+
+
+class MarkdownSchema(Schema):
+    text: str