Use tynt in NB 1

[bmorris3]

I suppose before #12 gets addressed, it'd be natural to request that you use tynt in the notebook.

While the destiny of the tynt package is under consideration (affiliated package vs. PR to synphot) , it should be sufficient to install tynt locally (pip install tynt) and to add a requirements.txt file to the notebook's directory which simply contains the name tynt, like in this tutorial.