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.

next/rules.html

@@ -11,7 +11,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
 <title>The International Obfuscated C Code Contest</title>
 <link rel="icon" type="image/x-icon" href="../favicon.ico">
-<meta name="description" content="IOCCC rules and guidelines">
+<meta name="description" content="IOCCC Rules">
 <meta name="keywords" content="IOCCC, rules, Rules">
 </head>