Website server update

In this weekend, I update cocos2d-x.org website server from a shared-host to dual VPS, one for Rails app & another for MYSQL.
And I play a small trick to avoid the “Page not found” error. It’s will be caused probably by posting a topic / issue whose operations cost more than 2000ms.

If you feel the performance is faster, or you still meet the 404 error / 500 error, please let me know.