Remove security section (#595)

It contains PHP 5 info and the never finished security center

Author: kamil-tekiela

error.php

@@ -248,6 +248,7 @@
 
     // Refactored
     'regexp.reference' => 'regexp.introduction',
+    "security" => "manual/security",
 ];
 
 if (isset($manual_page_moves[$URI])) {