update rules and guideline headers

Harmonized and improve the headers that are prepended
to the rules and guidelines given the IOCCC state.

Attempted to make the headers that are prepended
to the rules and guidelines more consistent.

Make reference to, where applicable, FAQs
about feedback and questions in those headers.

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

next/guidelines.md

@@ -8,6 +8,10 @@ They are are provided as a **VERY TENTATIVE** hint at **what
 MIGHT** be used in the next IOCCC.  In some cases they might
 even be a copy of the guidelines from the previous IOCCC.
 
+See our [FAQ about providing feedback](../faq.html#feedback) as well
+as our [FAQ about asking questions](../faq.html#question) about
+these quidelines.
+
 
 # The IOCCC is closed
 
@@ -19,6 +23,10 @@ Watch both [the IOCCC status page](../status.html) and the
 [@IOCCC mastodon feed](https://fosstodon.org/@ioccc) for information about
 future IOCCC openings.
 
+**HINT to mastodon users**: You may wish to refresh the [@IOCCC
+mastodon feed](https://fosstodon.org/@ioccc) page and/or mastodon
+app from time to time to view IOCCC mastodon updates.
+
 <!-- END: the next line ends content from: inc/guidelines.closed.hdr -->
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 # 28th International Obfuscated C Code Contest Official Guidelines