Update Dockerfile

Dockerfile

@@ -19,7 +19,7 @@ RUN mkdir -p /root/.ipython/profile_default/
 RUN chown 1000:1000 /root/.ipython/profile_default/
 
 RUN (echo "c = get_config()" && \
-     echo "headers = {'Content-Security-Policy': 'frame-ancestors *'}" && \
+     echo "headers = {'Content-Security-Policy': 'frame-ancestors self https://huggingface.co/spaces/osanseviero/jupyter'}" && \
      echo "c.NotebookApp.allow_origin = '*'" && \
      echo "c.NotebookApp.allow_credentials = True" && \
      echo "c.NotebookApp.tornado_settings = {'headers': headers}" && \