Tutorial improvements

[jakebeal]

Notes from @tcmitchell from the IWBDA'22 tutorial:

1. Make the necessary files easily accessible. For example, post requirements.txt and tutorial.ipynb to a slack channel. Or have a download on the community media site for just those files. The community media repo is huge and very slow to clone. this was a significant stumbling block for participants.
2. What are the true dependencies of the tutorial? PySBOL3 can work with Python 3.7, but a dependency of the tutorial depends on python pdf which does not appear to work with python 3.7. So what is the minimum version of python needed to run the tutorial?