finish book pages

 On branch master

	new file:   website/_content/3-books/the_appendix_ibook.md
	modified:   website/_content/3-books/the_gallbladder_ibook.md
	modified:   website/_themes/pinfinity/css/pinfinity.css
	modified:   website/_themes/pinfinity/partials/head-javascript.html
	modified:   website/_themes/pinfinity/templates/book.html