move ioccc.css to tmp/old-ioccc.css

The previous version of `/ioccc.css`, now `tmp/old-ioccc.css` to make
room for the new IOCCC css being developed.

index.html

@@ -3,7 +3,7 @@
 <HEAD>
   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
   <LINK REL="shortcut icon" HREF="/ioccc.ico">
-  <link rel="stylesheet" type="text/css" href="ioccc.css">
+  <link rel="stylesheet" type="text/css" href="tmp/old-ioccc.css">
   <META name="description" content="International Obfuscated C Code Contest">
   <META name="keywords" content="International, Obfuscated, C, c, IOCCC,ioccc, obfuscated, Obfuscate, obfuscate, Landon Curt Noll, chongo, Leonid A. Broukhis, leob">
   <TITLE>The International Obfuscated C Code Contest</TITLE>