Separate environments for notebooks with and without python and imglyb

I suggest to somehow separate those notebooks requiring `python` and `imglyb` from the "pure" ImageJ tutorial notebooks and create two distinct `environment.yml` files. This would allow the startup of the latter on mybinder.org to be much faster, due to smaller image sizes.

Inspect the repository's notebooks and existing environment.yml to identify which notebooks require Python and imglyb. Separate those dependencies into distinct environment files, then verify that the pure ImageJ tutorial notebooks still start through mybinder.org with the smaller environment.

Written by the indexing model from the issue text.