design update

Hi!

To improve try-haxe I created an update to prettify it and make it more friendly and in style of haxe.org. Hope you like it. 

* added haxe style header with links to docs
* font same as haxe website
* added example dropdown with 17 examples 
* added disclaimer that code is stored
* added about page
* made haxe source editor higher
* removed fullscreen button (found it quite pointless)