Config Book Content CLI Args book.toml SUMMARY.md markdown chapters template assets BookConfig lang project_root book_dest book_src template_path Book config metadata toc Renderer render(book) MDBook project_root books renderer images BookMetadata title author publisher Vec<Chapter> title file YAML headers (optional) summary parser Vec<TocItem> content sub_items behaviour control, paths, target format paths metadata chapter list chapter attributes chapter content renderer specific data template path