Update the nbdev version to nbdev2

[butchtm]

This will improve the doc site aesthetics (see new nbdev)

• replaces jekyll w/ quarto for site generation
• removes need for custom nbdev (since black formatting is already implemented in nbdev2)
• lots of other improvements

Caveats:

• some features (e.g. source links) are still being worked on
• nbdev2 commands have changed slightly and will require readjustments esp. w/ GH workflows.
• need to test the update thoroughly before deploying to prod.

[tm-kah-alforja]

on pause; waiting for updates on missing features

[joshuacortez]

@butchtm migration to nbdev2 is fully done right? I'm closing this issue