checkpoint rules version 29.04 2025-11-20

Switched to "#" (hash) for headings in `rules.md`.

Added "-" (dash) after the rule number and before the
rule keyword.

Adjusted links rules elsewhere according to the above.

Ran `make quick_www` to perform the above.

status.html

@@ -461,7 +461,7 @@
         "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" : "2025-11-20T06:10:33+00:00",
+        "news_update" : "2025-11-21T00:07:02+00:00",
         "status_update" : "2025-08-01T19:38:14+00:00"
     }</code></pre>