Add PDF conversion as an option

[michaelgao8]

Currently, the conversion to a pdf file, which would normally work as follows:

nbconvert  --to pdf <original_notebook.ipynb>

However, this functionality does not currently work because of a missing pandoc and tex installation.

To work on this, it may be useful to shell into the container and try to install the packages as referenced here (note that the docker container uses apt as its package manager)
and then test the functionality.

Ultimately, this should then be incorporated in the docker container itself. To try this on a fresh image, rebuild the container and then try to convert a file to pdf.

nbconvert pdf