Added link

Author: dabeaz

_layouts/default.html

@@ -24,7 +24,7 @@
 
     <header class="page-header" role="banner">
       <h1 class="project-name">Practical Python Programming</h1>
-      <h2 class="project-tagline">A course by David Beazley (@dabeaz)</h2>
+      <h2 class="project-tagline">A course by David Beazley (<a href="https://dabeaz.com">@dabeaz</a>)</h2>
       <!--{% if site.github.is_project_page %}
         <a href="{{ site.github.repository_url }}" class="btn">View on GitHub</a>
       {% endif %}