Updated default.html to reflect move to github.

Author: Stewori

_layouts/default.html

@@ -16,7 +16,7 @@
     <!-- HEADER -->
     <div id="header_wrap" class="outer">
         <header class="inner">
-          <a id="forkme_banner" href="https://github.com/jythontools/jython">View on Github</a>
+          <a id="forkme_banner" href="https://github.com/jython/jython">View on Github</a>
 
           <a id=logo href="index"><img id="logo"  src="assets/jython.png" alt="Jython Logo" height="70" width="109"></a>