Remove jupyter_notebook_config.py (#1945)

* Remove jupyter_notebook_config.py

* Update Dockerfile

base-notebook/Dockerfile

@@ -56,16 +56,11 @@ CMD ["start-notebook.sh"]
 
 # Copy local files as late as possible to avoid cache busting
 COPY start-notebook.sh start-singleuser.sh /usr/local/bin/
-# Currently need to have both jupyter_notebook_config and jupyter_server_config to support classic and lab
 COPY jupyter_server_config.py docker_healthcheck.py /etc/jupyter/
 
 # Fix permissions on /etc/jupyter as root
 USER root
-
-# Legacy for Jupyter Notebook Server, see: [#1205](https://github.com/jupyter/docker-stacks/issues/1205)
-RUN sed -re "s/c.ServerApp/c.NotebookApp/g" \
-    /etc/jupyter/jupyter_server_config.py > /etc/jupyter/jupyter_notebook_config.py && \
-    fix-permissions /etc/jupyter/
+RUN fix-permissions /etc/jupyter/
 
 # HEALTHCHECK documentation: https://docs.docker.com/engine/reference/builder/#healthcheck
 # This healtcheck works well for `lab`, `notebook`, `nbclassic`, `server` and `retro` jupyter commands