One thing I’d really like to One thing I’d really like to have for all the books and why not the blog as well, is a navigation sidebar. Having the tree visible on the side would make it easy to keep track of where you were in the read. A nav at the bottom is mostly bad UX. Put the Meaningness structure into a notetaking app like OneNote, Evernote or Notion and you’d find you have a far better sense of place. The book is built as an ordered tree, show us the tree.