Merge branch 'docs_update' into 'main'

.cache/plugin/social/e4665e2507cbe100841b0959a0e48ef6.png

docs/assets/qim3d-icon.png

docs/assets/qim3d-icon.svg

docs/assets/qim3d-logo.png

docs/assets/qim3d-logo.svg

docs/assets/screenshots/CLI-k3d.png

docs/assets/screenshots/GUI-data_explorer.png

docs/assets/screenshots/GUI-iso3d.png

docs/assets/screenshots/GUI-local_thickness.png

docs/assets/screenshots/qim3d-filters_example.png

docs/assets/screenshots/viz-k3d.png

docs/assets/screenshots/viz-slices.png

docs/cli.md

docs/gui.md

docs/index.md

docs/io.md

docs/models.md

docs/releases.md

docs/stylesheets/extra.css

docs/utils.md