start of book pages

 On branch master

	modified:   website/_content/3-books/page.md
	new file:   website/_content/3-books/the_gallbladder_ibook.md
	modified:   website/_themes/pinfinity/css/pinfinity.css
	new file:   website/_themes/pinfinity/templates/book.html
	modified:   website/_themes/pinfinity/templates/home.html
	deleted:    website/assets/img/ipad-2.png