papermill

the documentation doesn't mention that in order for the plugin to work, it must be installed in the same process that runs jupyterlab (users may install it in the kernel)

we should mention that here: https://docs.ploomber.io/en/latest/user-guide/jupyter.html#troubleshooting-pipeline-loading

also, we should link from this section to the troubleshoot section: https://docs.ploomber.io/en/latest

I started building[1] on an example from the docs here, but wasn't able to find a method to remove these sample Scraps added with glue:

sb.glue("hello", "world")
sb.glue("number", 123)
sb.glue("some_list", [1, 3, 5])
sb.glue("some_dict", {"a": 1, "b": 2})
sb.glue("non_json", df, 'pandas')

Does a reverse operat

Currently, nbcelltests' tests use various .ipynb files stored in nbcelltests/tests. Instead, we should generate notebooks as needed during the tests.

Doing this will allow various bits of test code to be simplified.