missing VoilaKernelManager config options displayed in help #1130
Description
Problem
The configuration options for VoilaKernelManager do not appear with the command voila --help-all. I expected to find a description of the relevant config options, e.g. https://voila.readthedocs.io/en/stable/customize.html#preheated-kernels. I suspect this was missed during the integration of the preheated kernels. For example, I could not find information on the preheated_blacklist config option mentioned in the linked page.
Suggested Improvement
Add all of the relevant config options for VoilaKernelManager when help is displayed.