minor

[eeholmes]

• [x] ~remove that man stuff. unneeded~ bad idea. then no man
• [x] remove the jupyterhub stuff; old
• [x] unpin the packages
• [x] ~add texlive path to python part. I think it is not there~ it's good
• [x] install more tlmgr packages pdfcol, tcolorbox, eurosym, upquote, adjustbox, titling, enumitem, ulem, soul, rsfs
• [ ] #83
• [ ] check DASK https://github.com/pangeo-data/pangeo-docker-images/blob/09567e9e95aee62714ff8bf7cd63e05c9c0866e0/base-image/Dockerfile#L39

# Ask dask to read config from ${CONDA_DIR}/etc rather than
# the default of /etc, since the non-root jovyan user can write
# to ${CONDA_DIR}/etc but not to /etc
ENV DASK_ROOT_CONFIG=${CONDA_DIR}/etc