Removed unit_system from display annotation

docs/reference/annotations.md

gui/src/components/archive/ArchiveBrowser.js

gui/src/components/archive/ArchiveBrowser.spec.js

gui/src/components/archive/Browser.spec.js

gui/src/components/archive/QuantityItemPreview.spec.js

gui/src/components/archive/Section.spec.js

gui/src/components/archive/conftest.spec.js

gui/src/components/editQuantity/NumberEditQuantity.spec.js

gui/src/components/entry/OverviewView.js

gui/src/components/units/useDisplayUnit.js

nomad/datamodel/metainfo/annotations.py