once all of the working pieces are in order (#6, #8), we should have a JupyterLab extension for talking to HubShare.
at least: uploading new/updated shares (a basic 'share' button would be), so users have a mechanism to start uploading things.
possibly (maybe too far): browsing, downloading existing shares. This might be nice, but would be redundant with UI already required to do the same on HubShare itself, so a lower priority. A link to HubShare would be enough to start.
once all of the working pieces are in order (#6, #8), we should have a JupyterLab extension for talking to HubShare.