It has repeatedly been observed here that Quiver and Jupyter have a lot in common. One thing I'm missing with Jupyter, though, is a convenient infrastructure for dealing with a large number of small notes. Are you using one notebook for each note?
Yes, though I break it up into different (labelled) sections, so I don't have a large number of files. It may just work for me since I tend to write longish overviews of things (papers, concepts, experiments, etc.).