delete perspective

Author: DeadAt0m

Dockerfile.DLkernel

@@ -81,6 +81,5 @@ RUN jupyter nbextension enable --py widgetsnbextension --sys-prefix && \
 jupyter labextension install jupyterlab_filetree && \
 jupyter labextension install jupyterlab-theme-solarized-dark && \
 jupyter labextension install shared_kernel && \
-jupyter labextension install @finos/perspective-jupyterlab && \
 npm cache clean --force