Redirect google.github.io/iree to openxla.github.io/iree

Author: GMNGeoffrey

Diff for: 404.html

@@ -102,7 +102,8 @@ <h1>404</h1>
           'google-auth-library-nodejs': 'googleapis',
           'google-http-java-client':    'googleapis',
           'google-oauth-java-client':   'googleapis',
-          'oauth2client':               'googleapis'
+          'oauth2client':               'googleapis',
+          'iree':                       'openxla',
         };
 
         var repoRegex = new RegExp('^/([^/]+)(/|$)');