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.

1987/korn/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#David_Korn">David Korn</a><br>
-Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
-<br><br></li>
+Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
 </ul>
 
 <!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,9 +141,9 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- 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> all</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> all</span></code></pre></div>
 <h2 id="to-use">To use:</h2>
-<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">./korn</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">./korn</span></span></code></pre></div>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>The Judges believe that this is the best one line entry ever received.
 Compile on a UNIX system, or at least one using a C implementation that
@@ -159,17 +158,17 @@ section right now and see if you are one of the few people who can.</p>
 <li><p>What is the value of the symbol <code>"have"</code>? (hint: the value is NOT 4
 characters, or <code>'h'</code>, or a string) Consider the fact that:</p></li>
 </ol>
-<div class="sourceCode" id="cb3"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="dt">char</span> <span class="op">*</span>x<span class="op">;</span></span></code></pre></div>
+<div class="sourceCode" id="cb3"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>    <span class="dt">char</span> <span class="op">*</span>x<span class="op">;</span></span></code></pre></div>
 <p>defines a pointer to a <code>char</code> (i.e. an address), and that the <code>=</code> assigns
 things of compatible types. Since:</p>
-<div class="sourceCode" id="cb4"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>x <span class="op">=</span> <span class="st">&quot;have&quot;</span><span class="op">;</span></span></code></pre></div>
+<div class="sourceCode" id="cb4"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>    x <span class="op">=</span> <span class="st">&quot;have&quot;</span><span class="op">;</span></span></code></pre></div>
 <p>is legal C, what type of value is <code>"have"</code>?</p>
 <ol start="3" type="1">
 <li>Note that the following expressions yield the same value:</li>
 </ol>
-<div class="sourceCode" id="cb5"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>x<span class="op">[</span><span class="dv">3</span><span class="op">]</span>    <span class="op">*(</span>x<span class="op">+</span><span class="dv">3</span><span class="op">)</span>    <span class="op">*(</span><span class="dv">3</span><span class="op">+</span>x<span class="op">)</span></span></code></pre></div>
+<div class="sourceCode" id="cb5"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>    x<span class="op">[</span><span class="dv">3</span><span class="op">]</span>        <span class="op">*(</span>x<span class="op">+</span><span class="dv">3</span><span class="op">)</span>    <span class="op">*(</span><span class="dv">3</span><span class="op">+</span>x<span class="op">)</span></span></code></pre></div>
 <p>since addition is commutative. What can be said about this value?</p>
-<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="dv">3</span><span class="op">[</span>x<span class="op">]</span></span></code></pre></div>
+<div class="sourceCode" id="cb6"><pre class="sourceCode c"><code class="sourceCode c"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>    <span class="dv">3</span><span class="op">[</span>x<span class="op">]</span></span></code></pre></div>
 <p><a href="https://news.slashdot.org/story/01/02/06/2030205/david-korn-tells-all">David
 Korn</a>’s
 <a href="https://en.wikipedia.org/wiki/KornShell">/bin/ksh</a> provides us with a greatly