improve HTML menus, add social.html, prep for IOCCC28 winners

Prepare for the winners of **IOCCC28**.

> However these are not the 2024 droids you are looking for.  :-)

The HTML menu (both JavaScript and non-JavaScript) has been updated.

The `Status -> Rules and guidelines' have been replaced with two
separate menus `Status -> IOCCC rules` and `Status -> IOCCC guidelines`.

Added a new top level `social.html` page: built from a new `social.md`.

Sorted rules for building specific web pages in the top level `Makefile`.
Added `make social` to make the `social.html` page from `social.md`.

The `bin/gen-top-html.sh` now is able to process a argument of **social**
to process the new top level `social.html` page.

Changed `bin/gen-top-html.sh` VERSION from "2.0.0 2025-03-13"
to "2.0.1 2025-07-25".

Below `About -> Home page` a new `About -> IOCCC social media` menu item
as added.

Because the menu change touched every HTML file, we changed the general
copyright date range for HTML files from "1984-2024" to "1984-2025"
due to the extensive changes made for **IOCCC28**.

Those markdown files that were modified in 2025 had their copyright date
range also changed from "1984-2024" to "1984-2025".

Rebuilt tarballs and sitemap due to the extensive HTML rebuilding.

Ran `make update` to perform the above.

about.html

@@ -60,6 +60,7 @@
           </span>
 
           <div class="sub-item">
+
             <div class="outfit-font">
               <a href="./years.html" class="sub-item-link">
                 Winning entries
@@ -95,6 +96,7 @@
                 Updating author info
               </a>
             </div>
+
           </div>
         </div>
 
@@ -104,6 +106,7 @@
           </span>
 
           <div class="sub-item">
+
             <div class="outfit-font">
               <a href="./news.html" class="sub-item-link">
                 News
@@ -117,8 +120,14 @@
             </div>
 
             <div class="outfit-font">
-              <a href="./next/index.html" class="sub-item-link">
-                Rules and guidelines
+              <a href="./next/rules.html" class="sub-item-link">
+                IOCCC rules
+              </a>
+            </div>
+
+            <div class="outfit-font">
+              <a href="./next/guidelines.html" class="sub-item-link">
+                IOCCC guidelines
               </a>
             </div>
 
@@ -143,9 +152,10 @@
           </span>
 
           <div class="sub-item">
+
             <div class="outfit-font">
               <a href="./faq.html" class="sub-item-link">
-                  Frequently Asked Questions
+                Frequently asked questions
               </a>
             </div>
 
@@ -182,12 +192,19 @@
           </span>
 
           <div class="sub-item">
+
             <div class="outfit-font">
               <a href="./index.html" class="sub-item-link">
                 Home page
               </a>
             </div>
 
+            <div class="outfit-font">
+              <a href="./social.html" class="sub-item-link">
+                IOCCC social media
+              </a>
+            </div>
+
             <div class="outfit-font">
               <a href="./about.html" class="sub-item-link">
                 About the IOCCC
@@ -196,7 +213,7 @@
 
             <div class="outfit-font">
               <a href="./judges.html" class="sub-item-link">
-                The Judges
+                The judges
               </a>
             </div>
 
@@ -276,6 +293,7 @@
             <a class="mobile-submenu-item" href="./thanks-for-help.html">
               Thanks for the help
             </a>
+
           </div>
         </div>
 
@@ -294,8 +312,12 @@
               Contest status
             </a>
 
-            <a class="mobile-submenu-item" href="./next/index.html">
-              Rules and guidelines
+            <a class="mobile-submenu-item" href="./next/rules.html">
+              IOCCC rules
+            </a>
+
+            <a class="mobile-submenu-item" href="./next/guidelines.html">
+              IOCCC guidelines
             </a>
 
             <a class="mobile-submenu-item" href="./markdown.html">
@@ -305,6 +327,7 @@
             <a class="mobile-submenu-item" href="./SECURITY.html">
               Security policy
             </a>
+
           </div>
         </div>
 
@@ -315,7 +338,7 @@
           <div class="mobile-submenu-wrapper">
 
             <a class="mobile-submenu-item" href="./faq.html">
-              Frequently Asked Questions
+              Frequently asked questions
             </a>
 
             <a class="mobile-submenu-item" href="./quick-start.html#enter">
@@ -347,17 +370,22 @@
               Home page
             </a>
 
+            <a class="mobile-submenu-item" href="./social.html">
+              IOCCC social media
+            </a>
+
             <a class="mobile-submenu-item" href="./about.html">
               About the IOCCC
             </a>
 
             <a class="mobile-submenu-item" href="./judges.html">
-              The Judges
+              The judges
             </a>
 
             <a class="mobile-submenu-item" href="./contact.html">
               Contact us
             </a>
+
           </div>
         </div>
       </div>
@@ -478,7 +506,7 @@ and inexplicable.</p>
 
 <!--
 
-    Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
+    Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
 
     You are free to share and adapt this file under the terms of this license:
 
@@ -492,7 +520,7 @@ and inexplicable.</p>
 
 <div class="footer">
 
-    <div id="copyright"><h3>Copyright &copy; 1984-2024 by Landon Curt Noll:
+    <div id="copyright"><h3>Copyright &copy; 1984-2025 by Landon Curt Noll:
 	<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
 	   target="_blank"
 	   rel="license noopener noreferrer">Some Rights Reserved</a></h3>