improve PR #246 - part 1

Fixed links between rules and guidelines.

Add guideline about "Rule 2 - Size restrictions" not changing soon.

Expand "Guidelines for Rule 13 - No carriage returns in prog.c".

Put the word, "restrictions" into "Rule 2 - Size restrictions".
While this is a **GOOD IDEA**, the concept needs to be rolled out
over all of the rules, not just "Rule 2 - Size restrictions".

Changed IOCCC Rules to version **29.13 2025-12-01**.
Changed IOCCC Guidelines to version **29.06 2025-12-01**.

Ran `make quick_www` to perform the above.

sitemap.xml

@@ -16758,11 +16758,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.html</loc>
-    <lastmod>2025-12-01T05:53:50+00:00</lastmod>
+    <lastmod>2025-12-02T01:59:41+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/faq.md</loc>
-    <lastmod>2025-12-01T05:53:50+00:00</lastmod>
+    <lastmod>2025-12-02T01:58:21+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/inc/index.html</loc>
@@ -16826,11 +16826,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/next/guidelines.html</loc>
-    <lastmod>2025-12-01T12:23:32+00:00</lastmod>
+    <lastmod>2025-12-02T03:51:13+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/guidelines.md</loc>
-    <lastmod>2025-12-01T12:23:12+00:00</lastmod>
+    <lastmod>2025-12-02T03:41:39+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/index.html</loc>
@@ -16870,11 +16870,11 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/next/rules.html</loc>
-    <lastmod>2025-12-01T10:26:00+00:00</lastmod>
+    <lastmod>2025-12-02T03:51:14+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/rules.md</loc>
-    <lastmod>2025-12-01T10:21:01+00:00</lastmod>
+    <lastmod>2025-12-02T03:42:10+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/next/submit.html</loc>
@@ -16938,7 +16938,7 @@
 </url>
 <url>
     <loc>https://www.ioccc.org/status.html</loc>
-    <lastmod>2025-12-01T09:18:23+00:00</lastmod>
+    <lastmod>2025-12-02T03:51:32+00:00</lastmod>
 </url>
 <url>
     <loc>https://www.ioccc.org/status.json</loc>