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.

bin/untar-year.sh

@@ -83,7 +83,7 @@ shopt -s globstar	# enable ** to match all files and zero or more directories an
 
 # set variables referenced in the usage message
 #
-export VERSION="1.0.1 2024-04-13"
+export VERSION="1.0.2 2024-04-14"
 NAME=$(basename "$0")
 export NAME
 export V_FLAG=0
@@ -267,7 +267,7 @@ if [[ ! -d $YYYY ]]; then
     exit 6
 fi
 if [[ ! -r $YYYY ]]; then
-    echo "$0: ERROR: arg is not a writable directory: $YYYY" 1>&2
+    echo "$0: ERROR: arg is not a readable directory: $YYYY" 1>&2
     exit 6
 fi