improved indentation and whitespace for markdown code blocks

All code blocks in markdown have been intended by at least 4 spaces.

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 from "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`.

Fixed excess whitespace after list Author on entry `index.html` page.

Changed `bin/output-index-author.sh` VERSION from "1.5.2 2024-03-26"
to "1.6 2024-03-31".

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

TODO: Fix the problem of the initial line of code being extra intended.
TODO: Fix excess whitespace around code that is inline.

2013/morgan2/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Yves-Marie_Morgan">Yves-Marie Morgan</a><br>
-Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)
-<br><br></li>
+Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)</li>
 </ul>
 
 <!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,12 +141,12 @@ Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<e
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <h2 id="to-build">To build:</h2>
-<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span></span></code></pre></div>
+<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>    <span class="fu">make</span></span></code></pre></div>
 <h2 id="to-use">To use:</h2>
 <p>For the console version (ncurses):</p>
-<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./morgan2</span></span></code></pre></div>
+<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./morgan2</span></span></code></pre></div>
 <p>For the graphical version (X11):</p>
-<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./morgan2</span> X</span></code></pre></div>
+<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./morgan2</span> X</span></code></pre></div>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>The judges enjoyed playing the game almost to completion; if we remember
 correctly, we managed to place 59 or 60 dominoes. We wonder, what would be
@@ -228,9 +227,9 @@ use.</li>
 </ul>
 <h3 id="compilation-warnings">Compilation warnings</h3>
 <p>With gcc 4.7.2 on Linux Ubuntu 12.10 :</p>
-<pre><code>morgan2.c:46:65: warning: value computed is not used [-Wunused-value]</code></pre>
+<pre><code>    morgan2.c:46:65: warning: value computed is not used [-Wunused-value]</code></pre>
 <p>With clang 3.1 on Linux Ubuntu 12.10 :</p>
-<pre><code>morgan2.c:23:24: warning: adding &#39;int&#39; to a string does not append to the string [-Wstring-plus-int]</code></pre>
+<pre><code>    morgan2.c:23:24: warning: adding &#39;int&#39; to a string does not append to the string [-Wstring-plus-int]</code></pre>
 <p><strong>!!!!! HAVE FUN !!!!!</strong></p>
 <!--