Keepalive

- Fix directory path
- Remove duplicate file
- Add to client portal

keepalive.php

@@ -1,7 +1,7 @@
 <?php
 
 // Keep PHP sessions alive
-// Receives requests via AJAX in the background every 10 mins to prevent PHP garbage collection ending sessions
+// Receives requests via AJAX in the background every 8 mins to prevent PHP garbage collection ending sessions
 //  See footer.php & js/keepalive.js
 
 session_start();