set header width to 100%

set #header width to 100% in "style.css"
added references to Tumblr art blog

added a link to my Tumblr art blog on "art.html", and added my Tumblr
art blog to the websites list on "websites.html"
moved website icons in front of website names

moved the website icons in the website list in "websites.html" to be in
front of the names of the websites they are for