checkpoint guideline fixes

Attempt to fix HTML5 errors.

Remove Makefile section from Guidelines as
this is in the FAQ.

Added links to Makefile FAQ in Guidelines.

Ran `make quick_www` to perform the above

TODO: Complete the correction for issue #244 ("Restore guidelines").

TODO: Continue to revise and improve the IOCCC guidelines as needed.

TODO: Fix typos/nits in the `next/guidelines.md` if needed.

TODO: Fix typos/nits in the `next/rules.md` if needed.

sitemap.xml

@@ -16826,11 +16826,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/next/guidelines.html</loc>
-    <lastmod>2025-11-29T23:08:54+00:00</lastmod>
+    <lastmod>2025-11-30T01:19:21+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/guidelines.md</loc>
-    <lastmod>2025-11-29T23:23:33+00:00</lastmod>
+    <lastmod>2025-11-30T01:18:54+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/index.html</loc>
@@ -16938,7 +16938,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/status.html</loc>
-    <lastmod>2025-11-30T00:36:15+00:00</lastmod>
+    <lastmod>2025-11-30T01:25:49+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/status.json</loc>