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/anon/index.html

@@ -421,7 +421,7 @@ is the loop body. <code>Z</code> is the post-loop code in the current state. For
 <span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a>other_code<span class="op">)</span></span></code></pre></div>
 <p>is equivalent to:</p>
 <div class="sourceCode" id="cb18"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="cf">for</span> <span class="op">(</span>i<span class="op">=</span><span class="dv">0</span><span class="op">;</span> i<span class="op">&amp;</span>lt<span class="op">;</span><span class="dv">10</span><span class="op">;</span> i<span class="op">++)</span> <span class="op">{</span></span>
-<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a>    some_code<span class="op">;</span></span>
+<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a>        some_code<span class="op">;</span></span>
 <span id="cb18-3"><a href="#cb18-3" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
 <span id="cb18-4"><a href="#cb18-4" aria-hidden="true" tabindex="-1"></a>other_code<span class="op">;</span></span></code></pre></div>
 <p>Note the “wrong” indentation in the former: the author prefers to write it
@@ -503,11 +503,11 @@ smiley. :-)</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/
 
 -->
 
@@ -570,7 +570,7 @@ smiley. :-)</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>