I would need a way to include / exclude contents

[parmentelat]

unless I missed it, there seems to be a way to exclude stuff, but no way to include stuff
I mean, these pages
https://jupyterbook.org/en/stable/content/execute.html#exclude-files-from-execution
https://jupyterbook.org/en/stable/structure/configure.html#exclude-pages-from-your-build
mention an exclude_patterns setting, but nothing about including

my use case

I typically have a collection of notebooks, each with any number of artefacts (python modules, accessory markdown files, etc..)
also the notebooks are all jupytext-encoded as .py or .md files
for that reason I have adopted a naming convention, so that notebooks stick out as *-nb.py or *-nb.md
having the ability to use this as the basis for selecting material would be so much more convenient than having to exclude the artefacts, that do not follow any particular scheme !

a possible inspiration

of course there is a need to specify how inclusion and exclusion could coexist
in this respect we have the example of rsync that allows for such a mechanism
see e.g. https://shallowsky.com/blog/linux/cmdline/rsync-include-exclude.html
a possible data model for this configuration could then become

patterns:
  - type: include
    pattern: **/*-nb.py
  - type: include
    pattern: **/*-nb.md
  - type: exclude
    pattern: **/*

compatibility

and for compatibility of course exclude_patterns could be still supported and compiled into

patterns:
  - type: exclude
    pattern: pattern1
  - type: exclude
    pattern: pattern2
  - ...
  - type: include
    pattern: **/*

just a thought....