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.

2006/monge/index.html

@@ -225,18 +225,18 @@ as you like (as understood by the C function <code>isspace()</code>).</p>
 <pre><code>Operation | Description
 :-------- | :----------
  +,-,*,/    | Arithmetic operations, priority of  * , /  over  +,-  is
-        | respected.
-        |
+            | respected.
+            |
  &lt;,&gt;        | Compares the real parts of two complex numbers (the imaginary part
-        | is ignored). Any number of conditions is allowed, the iteration
-        | will just stop as soon as one of them fails.
+            | is ignored). Any number of conditions is allowed, the iteration
+            | will just stop as soon as one of them fails.
  Abs2       | Calculates the squared norm, i.e.: Abs2(a+b*i) is (a*a+b*b)+0*i.
  Re         | Extract the real part, i.e.: Re(a+b*i) is a+0*i.
  Im         | Extract the imaginary part, i.e.: Im(a+b*i) is b+0*i.
  Exp        | Calculates the complex exponential, i.e. Exp(a+b*i) is
-        |   e^a*(cos(b)+sin(b)*i).
+            |   e^a*(cos(b)+sin(b)*i).
  Ln         | Calculates the principal value of the natural logarithm, i.e.
-           Ln(a+b*i) is ln(a*a+b*b)/2 + atan(b/a)*i.</code></pre>
+               Ln(a+b*i) is ln(a*a+b*b)/2 + atan(b/a)*i.</code></pre>
 <p>Here are a few examples of fractals you can draw:</p>
 <ul>
 <li>Mandelbrot:</li>
@@ -330,11 +330,11 @@ too big (<code>&gt;1</code>) the pixel is recalculated.</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/
 
 -->
 
@@ -399,7 +399,7 @@ too big (<code>&gt;1</code>) the pixel is recalculated.</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>