css refactoring

 On branch master

	modified:   website/_content/1-about/page.md
	modified:   website/_content/3-books/page.md
	modified:   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/layouts/default.html
	modified:   website/_themes/pinfinity/partials/social-footer.html
	modified:   website/_themes/pinfinity/templates/blog_index.html
	modified:   website/_themes/pinfinity/templates/book.html
	modified:   website/_themes/pinfinity/templates/page.html