Generates the tag based folder structure
Tag/Author/Series (3) - Title/Author - Title.epub
{:'sublist(raw_list('tags', ','), 0, 1, ',')'}/{:'re(sublist(field('authors'), 0, 2, ','), ',', ' &')'}/{series}{series_index:| (|) - }{title:re(:, -)}/{:'re(sublist(field('authors'), 0, 2, ','), ',', ' &')'} - {title:re(:, -)}