remove nbserverproxy

Dockerfile

@@ -47,7 +47,6 @@ RUN conda env update -n root -f /environments/machine-learning.yml
 RUN jupyter nbextension enable --py --sys-prefix ipyparallel && \
     jupyter nbextension enable --py --sys-prefix jupyter_cms && \
     jupyter nbextension enable --py --sys-prefix jupyter_dashboards && \
-    jupyter nbextension enable --py --sys-prefix nbserverproxy && \
     jupyter labextension install @jupyter-widgets/jupyterlab-manager \
             @jupyterlab/katex-extension \
             jupyterlab_bokeh @pyviz/jupyterlab_holoviews

jupyter_notebook_config.py

@@ -28,5 +28,4 @@ NBApp.nbserver_extensions = {
   "jupyter_cms": True,
   "jupyter_dashboards": True,
   "ipyparallel.nbextension": True,
-  "nbserverproxy": True,
 }

machine-learning.yml

@@ -45,7 +45,6 @@ dependencies:
   - line_profiler
   - nbdime
   - nbstripout
-  - nbserverproxy
   - nb_conda
   - mistune>=0.8.1
   # other