fix guidelines, remove guideline status, update sitemap

This is a checkpoint correction for issue #244 ("Restore guidelines")
which in turn was a correction for issue #243 ("Fixes and minor
improvements in rules").

Remove code that put the contest status at the top
of the guidelines page.

Change `bin/gen-status.sh` VERSION to "2.1.0 2025-11-29",

Fix `next/guidelines.md` so that `next/guidelines.html`
is rendered correctly.

Update sitemap and status (due to recent news mod).

Ran `make quick_www` to perform the above

TODO: Complete the correction for issue #244 ("Restore guidelines").

TODO: Continue to revise and improve the IOCCC guidelines as needed.

TODO: Fix typos/nits in the `next/guidelines.md` if needed.

TODO: Fix typos/nits in the `next/rules.md` if needed.

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" : "2025-11-24T13:29:41+00:00",
+    "news_update" : "2025-11-29T22:23:16+00:00",
     "status_update" : "2025-08-01T19:38:14+00:00"
 }