Add proper header to about page

I really really disliked the italic-as-header "who runs this".

This is a purely stylistic choice that I snuck into this pull request
because I was too lazy to create another one.

Author: Christopher Carpenter

about/index.html

@@ -2,7 +2,7 @@
 layout: default
 ---
 
-<i>who runs this</i>
+<h1>Who runs this?</h1>
 
 articulate-lisp.com is designed to fill a gap in the current
 (2012-2015) resources for getting started with Common Lisp. It's the