set pandoc 8 character tab stops for HTML conversion

We add `--tab-stop=8` to all `pandoc(1)` executions in order to set
a better tab stop indentation, especially for tab intended code blocks.

Changed `bin/pandoc-wrapper.sh` VERSION "1.5.3 2024-03-26"
to "1.6 2024-03-31".

Fixed `1991/brnstnd/sorta.README.md` so that the sorta code
is code blocks.

Removed unneeded paragraph group in copyright in `inc/footer.default.html`.

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

2005/giljade/index.html

@@ -223,7 +223,7 @@ one is used. No inefficient conditional tests and jumps are needed in that
 part of the program.</p></li>
 <li><p>The single expression I’m most proud of, and would have submitted to the
 category of ‘best obfuscated short expression’ if there was one is:</p>
-<pre><code>  s=s^(b=s&amp;s-1^s)</code></pre>
+<p>s=s<sup>(b=s&amp;s-1</sup>s)</p>
 <p>Can you figure out what it does (very efficiently) and how it fits in the
 scheme of things?</p></li>
 <li><p>IMHO the program is easier to understand before running cpp on it. It is also
@@ -266,11 +266,11 @@ tricky.</p>
 
     You are free to share and adapt this file under the terms of this license:
 
-    Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
+        Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
 
     For more information, see:
 
-    https://creativecommons.org/licenses/by-sa/4.0/
+        https://creativecommons.org/licenses/by-sa/4.0/
 
 -->
 
@@ -334,7 +334,7 @@ tricky.</p>
 <div class="footer">
   <h2>Copyright and CC BY-SA 4.0 License</h2>
   <p>This file and web page is:</p>
-  <blockquote><p><b>Copyright &copy; 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
+  <blockquote><b>Copyright &copy; 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></blockquote>
   <p>You are free to share and adapt this file under the terms of this license:</p>
   <blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
   <p>For more information, see:</p>