improve IOCCC rules and guidelines

Fixed a number of typos, inconsistencies, and problems with the
rules and guidelines.

Improved how the closed version of the rules and guidelines declare
themselves at the top of the markdown and HTML file.

Changed `next/rules.md` VERSION from "2024-06-29-v28"
to "28.1 2024-06-29" in order to be more consistent
with IOCCC tool version format.

Changed `next/guidelines.md` VERSION from "2024-06-29-v28"
to "28.1 2024-06-29" in order to be more consistent
with IOCCC tool version format.

Make a minor format fix to `faq.md`.

Performed `make status` and `make www` to test the above umder macOS.

inc/guidelines.closed.hdr

@@ -5,9 +5,8 @@
 These guidelines are a **VERY TENTATIVE proposal** for the next IOCCC
 and are **VERY LIKELY** to be updated before the next IOCCC.
 They are are provided as a **VERY TENTATIVE** hint at **what
-MIGHT** be used in the next IOCCC.
-
-Please regard these guidelines as a historical archive.
+MIGHT** be used in the next IOCCC.  In some cases they might
+even be a copy of the guidelines from the previous IOCCC.
 
 
 # The IOCCC is closed

inc/rules.closed.hdr

@@ -5,9 +5,8 @@
 These rules are a **VERY TENTATIVE proposal** for the next IOCCC
 and are **VERY LIKELY** to be updated before the next IOCCC.
 They are are provided as a **very tentative** hint at **what
-MIGHT** be used in the next IOCCC.
-
-Please regard these rules as a historical archive.
+MIGHT** be used in the next IOCCC.  In some cases they might
+even be a copy of the rules from the previous IOCCC.
 
 
 # The IOCCC is closed