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.

2000/robison/index.html

@@ -231,38 +231,38 @@ them, in lg(N) time, depending upon a parameter.</p></li>
 </ol>
 <h3 id="drawings">DRAWINGS</h3>
 <h4 id="fig-1.">FIG 1.</h4>
-<pre><code>    +--+--+--+--+--+--+--+--+
-    |32|  |31|  |30|  |29|  |
-    +--+--+--+--+--+--+--+--+
-    |  |28|  |27|  |26|  |25|
-    +--+--+--+--+--+--+--+--+
-    |24|  |23|  |22|  |21|  |
-    +--+--+--+--+--+--+--+--+
-    |  |20|  |19|  |18|  |17|
-    +--+--+--+--+--+--+--+--+
-    |16|  |15|  |14|  |13|  |
-    +--+--+--+--+--+--+--+--+
-    |  |12|  |11|  |10|  | 9|
-    +--+--+--+--+--+--+--+--+
-    | 8|  | 7|  | 6|  | 5|  |
-    +--+--+--+--+--+--+--+--+
-    |  | 4|  | 3|  | 2|  | 1|
-    +--+--+--+--+--+--+--+--+</code></pre>
+<pre><code>        +--+--+--+--+--+--+--+--+
+        |32|  |31|  |30|  |29|  |
+        +--+--+--+--+--+--+--+--+
+        |  |28|  |27|  |26|  |25|
+        +--+--+--+--+--+--+--+--+
+        |24|  |23|  |22|  |21|  |
+        +--+--+--+--+--+--+--+--+
+        |  |20|  |19|  |18|  |17|
+        +--+--+--+--+--+--+--+--+
+        |16|  |15|  |14|  |13|  |
+        +--+--+--+--+--+--+--+--+
+        |  |12|  |11|  |10|  | 9|
+        +--+--+--+--+--+--+--+--+
+        | 8|  | 7|  | 6|  | 5|  |
+        +--+--+--+--+--+--+--+--+
+        |  | 4|  | 3|  | 2|  | 1|
+        +--+--+--+--+--+--+--+--+</code></pre>
 <h4 id="fig.-2.">FIG. 2.</h4>
-<pre><code>    1   0
-     \ /
-      .
-     / \
-    3   2</code></pre>
+<pre><code>        1   0
+         \ /
+          .
+         / \
+        3   2</code></pre>
 <h4 id="fig.-3.">FIG. 3.</h4>
-<pre><code>    o o X .  29
-     o . . . 25
-    o . . o  21
-     . o . o 17
-    x . . .  13
-     . . x .  9
-    x x . .   5
-     x x O x  1</code></pre>
+<pre><code>        o o X .  29
+         o . . . 25
+        o . . o  21
+         . o . o 17
+        x . . .  13
+         . . x .  9
+        x x . .   5
+         x x O x  1</code></pre>
 <h4 id="fig.-4">FIG. 4</h4>
 <p>[See attached listing.]</p>
 <!--
@@ -271,11 +271,11 @@ them, in lg(N) time, depending upon a parameter.</p></li>
 
     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/
 
 -->
 
@@ -337,7 +337,7 @@ them, in lg(N) time, depending upon a parameter.</p></li>
 <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>