Updated links in the README to correspond to the new website.

(cherry picked from commit 130759ac)

README

@@ -3,15 +3,15 @@ Mahara Readme
 
 Thanks for downloading Mahara! To install, please follow the instructions here:
 
-  http://www.mahara.org/wiki/En/Sysadmin_Guide/Installing_Mahara
+  http://wiki.mahara.org/System_Administrator%27s_Guide/Installing_Mahara
 
 If you already have a Mahara you wish to upgrade, follow the instructions here:
 
-  http://www.mahara.org/wiki/En/Sysadmin_Guide/Upgrading_Mahara
+  http://wiki.mahara.org/System_Administrator%27s_Guide/Upgrading_Mahara
 
 The best ways of obtaining support are:
 
  * #mahara on freenode (IRC) - live chat with other users and developers
- * http://www.mahara.org/forum - the Mahara project forums
+ * http://www.mahara.org/forums - the Mahara project forums
 
   -- the Mahara Development Team