info_tfgrid/heroscript/tfgrid4specs/book_collections.md

!!mdbook.export 
    title:'TFGrid Specs 4.0' 
    description:'TFGrid Specs 4.0 book'
    name:'tfgrid4specs' 
    summary_url:'https://git.threefold.info/tfgrid/info_tfgrid/src/branch/main/books/tfgrid4specs'
    collections:'tfgrid4specs, tech, tfgrid4' 
    production:0 //means we put it in summary