2020ac4883
Delete the top-level implementation superseded by the gallery/ package conversion (generate_gallery.py, orchestration/, root templates/ and assets/, python/ scripts), stray scratch files, and docs describing a container/GitLab-CI coverage workflow that no longer exists. Also drop two half-wired, never-invoked features: the backup_folder config/TUI option (create_backup() was never called from the pipeline) and the unfinished export-to-LaTeX JS/CSS. Update README's install instructions to the current Gitea remote.