JB2 related improvements

[bsipocz]

These are various improvements we can have as we have both the notebooks and this repo in JB2

• xref the notebooks, so they show up as nice hover overs, see comment Update high-energy environments #150 (comment)
• Use definition lists for listing e.g. compute envs and storage spaces, see comment here: Add formatting standards to the readme #151 (comment)