verify need for `ipyvolume` dependency

[bregeon]

needed in 3Dview notebook?

[bregeon]

one notebook LSST_CCOB_ghosts_3dview.ipynb indeed needs ipyvolume I shall add this to dependencies to keep it as an example.

[bregeon]

note that there is currently a but, that prevents visualization in jupyter notebooks, that can be fixed with:

mamba install pythreejs==2.3.0 I won't add this specifically to the environment.