Jupyter notebooks are an industry-standard format for sharing documents that mix markup, code, and figures. Mynerva uses notebooks as the starting point for authoring codices. This means you can use whatever workflow you're comfortable with to author codices (including using git to keep your codices under version control).
There are a few different ways to author Jupyter notebooks (including using VS Code), but this documentation will cover the most common way, using the Jupyter Notebook and Jupyter Lab environments.
This is probably the easiest method of installing Jupyter.