Fix Candy Box url (doublespeakgames#722)

as per doublespeakgames#693 - the current Candy Box url is dead and leads to spam. This fixes the url.

index.html

@@ -7,7 +7,7 @@
 		==================
 		
 		A minimalist text adventure by Michael Townsend and all his friends.
-		Inspired by Candy Box (http://candies.aniwey.net/)
+		Inspired by Candy Box (https://candybox2.github.io/candybox)
 		Contribute on GitHub! (https://github.com/doublespeakgames/adarkroom/)
 	-->
 	<title>A Dark Room</title>