Merge branch 'refactor_for_v0.4' into 'main'

README.md

docs/assets/qim3d.mp3

docs/generate.md

docs/index.md

docs/io.md

docs/notebooks/README.md

docs/releases.md

docs/stylesheets/extra.css

mkdocs.yml

qim3d/__init__.py

qim3d/cli.py

qim3d/examples/NT_128x128x128.tif

qim3d/examples/__init__.py

qim3d/examples/bone_128x128x128.tif

qim3d/examples/cement_128x128x128.tif

qim3d/examples/fly_150x256x256.tif

qim3d/examples/shell_225x128x128.tif

qim3d/generate/collection_.py

qim3d/gui/__init__.py

qim3d/gui/data_explorer.py