Merge branch 'improve-viz' into 'main'

.gitignore

docs/assets/screenshots/itk-vtk-viewer.gif

docs/cli.md

docs/viz.md

qim3d/cli.py

qim3d/utils/__init__.py

qim3d/utils/server.py

qim3d/viz/__init__.py

qim3d/viz/itk_vtk_viewer/__init__.py

qim3d/viz/itk_vtk_viewer/helpers.py

qim3d/viz/itk_vtk_viewer/install_nvm.sh

qim3d/viz/itk_vtk_viewer/installation.py

qim3d/viz/itk_vtk_viewer/run.py