info_tfgrid/heroscript/test/book_collections.md

!!mdbook.export 
    title:'Mdbook Test' 
    description:'Mdbook Test'
    name:'test' 
    summary_url:'https://git.threefold.info/tfgrid/info_tfgrid/src/branch/main/books/test'
    collections:'test' 
    production:0 //means we put it in summary