Link python files to tutorials

[dgmccart]

For each tutorial on the website, provide a python file for the user to download. We'd like to automate this process to avoid needing to keep track of updates as content on the website changes. Mkdocs gallery may be a suitable solution. @melissawm

[melissawm]

At the docs sync today we discussed how jupytext may be a good solution.

The workflow would include

• Converting all existing tutorials to python files using jupytext --to py <tutorial-name>.md
• Checking in those files to the repo as downloadable examples, either in the tutorials or in the examples folder
• Making sure md files and py files are synced (this can be done in CI, as jupytext's syncing capabilities depend on opening and saving files on Jupyter Notebook).
• Another option to sync files is to use a pre-commit hook

[melissawm]

This has been partially implemented in #68 , but I can see not all files have been converted. I'll investigate.

[melissawm]

It works now 🥳