Update header of guidelines.md and rules.md based on status.json

In a few cases, the error message related to a file or directory
test was corrected.

Changed `bin/gen-sitemap.sh` VERSION from "1.3.6 2024-04-13"
to "1.3.7 2024-04-14".

Changed `bin/gen-year-index.sh` VERSION from "1.0.6 2024-04-13"
to "1.0.7 2024-04-14".

Changed `bin/untar-year.sh` VERSION from "1.0.1 2024-04-13"
to "1.0.2 2024-04-14".

Updated `bin/gen-status.sh` to change the header of `next/guidelines.md`
and `next/rules.md` to match the _contest_status_ in `status.json`.

Moved `make gen_top_html` after `make gen_status` in `make www`
and in `make quick_www` rules in the top Makefile.

Changed `bin/gen-status.sh` VERSION from "1.2.1 2024-04-13"
to "1.3 2024-04-14".

Fixed the DESCRIPTION for `next/guidelines.html`.

Run `make www` to perform the above and test under macOS.

inc/rules.closed.hdr

@@ -0,0 +1,22 @@
+<!-- START: this line starts content from: inc/rules.closed.hdr -->
+
+# WARNING: These rules are OUT OF DATE
+
+They are a **very tentative proposal** for the next IOCCC
+that is **VERY LIKELY** to be updated before the next IOCCC.
+They are are provided as a **very tentative** hint at what
+might be used in a future IOCCC.
+
+Please regard these rules as a historic archive.
+
+
+# The IOCCC is closed
+
+The IOCCC is **NOT** accepting new submissions at this time.  See the
+[IOCCC winning entries page](years.html) for the entires that have won the IOCCC.
+
+Watch both [the IOCCC status page](status.html) and the
+[@IOCCC mastodon feed](https://fosstodon.org/@ioccc) for information about future IOCCC openings.
+
+<!-- END: the next line ends content from: inc/rules.closed.hdr -->
+<!-- This is the last line modified by the tool: bin/gen-status.sh -->