@cygnoir Here's how to add the bookshelf page to the main menu.

  1. Go to Design → Edit Custom Themes.
  2. Click Moondeer's Bookshelves followed by content/bookshelf.md.
  3. Add a new line with menu = "main" right below the line type = "bookshelf".
  4. Click Update Template and wait for your site to rebuild.
  5. Celebrate! 🎉