docs: revert body --- back to em-dash

docs: title separator polish (quoted pretty_name)

docs: replace em dashes with --- in data card body

docs: refresh data card (author edits)

docs: rewrite data card to follow HF official template

docs: restore explicit data_files split mappings in YAML configs

docs: refresh data card with FAIR principles + Datasheet for Datasets (Gebru et al. 2018)

Add evaluation note on query-document overlap in Rev2Rev

Super-squash branch 'main' using huggingface_hub