docs: clarify pt model use

feat: add auto download script

fix: skip train flag

chore: code formatting using ruff

fix: typos and small revisions

docs: clean up typos and README

fix: sifigan postprocessing

fix: instructions order

fix gdrive script download

feat: add decoding after cyclic training

fix: google drive link

docs: add arxiv link

fix: typos for bugs

docs: update README and LICENSE files

chore: clean up