nb: `nb run`

The nb notetaking tool has a run subcommand to run arbitrary shell commands in a notebook.

This is useful to open an editor in the folder with the files from any working directory:

nb run vim      # current notebook
nb foo:run vim  # specific notebook

or to perform a text search on the notebook files from any working directory:

nb run rg "docker"      # current notebook
nb foo:run rg "docker"  # specific notebook