Updated documentation links to point to GitHub

Author: I3ck

doc/header.html

@@ -11,12 +11,12 @@
 <table width="100%">
   <tr>
     <td width="40%" align="left" valign="center">
-      <a href="http://sourceforge.net/projects/jsoncpp/">
+      <a href="https://github.com/open-source-parsers/jsoncpp">
       JsonCpp project page
       </a>
     </td>
     <td width="40%" align="right" valign="center">
-      <a href="http://jsoncpp.sourceforge.net">JsonCpp home page</a>
+      <a href="https://github.com/open-source-parsers/jsoncpp">JsonCpp home page</a>
     </td>
   </tr>
 </table>