postBuild

jupyter nbextension install hide_code --py --sys-prefix
jupyter nbextension enable hide_code --py --sys-prefix
jupyter serverextension enable hide_code --py --sys-prefix

# hack to use allow headless wkhtmltopdf via xvfb on Ubuntu/Debian see: 
# https://github.com/fomightez/jupyter_hide_code/blob/master/postBuild
# https://github.com/JazzCore/python-pdfkit/wiki/Using-wkhtmltopdf-without-X-server 
cd ~
# enable xvfb with wkhtmltopdf as described here so it will work with pdfkit similar to as shown at https://github.com/JazzCore/python-pdfkit/wiki/Using-wkhtmltopdf-without-X-server and more like how I activated orca with xvfb at https://github.com/fomightez/orca-plotly-binderized/blob/master/postBuild 
# When this works, it should allow the test at the last line of the code at https://github.com/JazzCore/python-pdfkit/wiki/Using-wkhtmltopdf-without-X-server , i.e., `wkhtmltopdf http://www.google.com output.pdf`, at least not give that it cannot connect to X display
mkdir -p ~/.local/bin
printf '#!/bin/bash \nxvfb-run --auto-servernum --server-args "-screen 0 640x480x24" /usr/bin/wkhtmltopdf  "$@"' > ~/.local/bin/wkhtmltopdf.sh
chmod 777 ~/.local/bin/wkhtmltopdf.sh
ln -s ~/.local/bin/wkhtmltopdf.sh ~/.local/bin/wkhtmltopdf