improve how status.json is displayed in status.html

The contents of `status.json` is now indented when
forming `status.html.

Changed `bin/status2html.sh` VERSION from to "1.3.1 2024-04-16"
to "1.4 2024-04-18".

Run `make gen_status` to perform the above.

status.json

@@ -2,6 +2,6 @@
     "no_comment" : "mandatory comment: because comments were removed from the original JSON spec",
     "IOCCC_status_version" : "1.0 2024-03-09",
     "contest_status" : "closed",
-    "news_update" : "2024-04-12T18:22:04+00:00",
+    "news_update" : "2024-04-18T22:49:50+00:00",
     "status_update" : "2024-03-31T05:02:06+00:00"
 }