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.

1990/theorem/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Adrian_Mariano">Adrian Mariano</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 -->
@@ -142,21 +141,21 @@ 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>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
 <p>The current status of this entry is:</p>
-<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
+<pre><code>    STATUS: INABIAF - please **DO NOT** fix</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#1990_theorem">1990 theorem bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<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">./theorem</span> expression x1 x2 h y1</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">./theorem</span> expression x1 x2 h y1</span></code></pre></div>
 <p>where:</p>
-<pre><code>expression - function f(x,y)  (see below)
-x1 - start of interval
-x2 - end of interval
-h - step size
-y1 - initial value  (y(x1) == y1)</code></pre>
+<pre><code>    expression - function f(x,y)  (see below)
+    x1 - start of interval
+    x2 - end of interval
+    h - step size
+    y1 - initial value  (y(x1) == y1)</code></pre>
 <h2 id="try">Try:</h2>
-<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
+<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./try.sh</span></span></code></pre></div>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>The program’s source implements four functions, all from the
 same source file!</p>
@@ -165,31 +164,31 @@ numerically solves the equation <code>y'=f(x,y)</code>, with a step size of <cod
 usage), over the interval <code>x=[x1,x2]</code>, with the initial condition of <code>y(x1)=y1</code>.</p>
 <p>The ‘expression’ <code>f(x,y)</code> is any function of <code>x</code> and <code>y</code> with the
 operators:</p>
-<pre><code>+       -       *       /       ^</code></pre>
+<pre><code>    +   -       *       /       ^</code></pre>
 <p>The symbol <code>^</code> is the power operator. Note that it only supports
 integer powers. Also note that all expressions are evaluated strictly
 left to right. (i.e., parenthesis aren’t supported).</p>
 <p>Try running the program with the following args:</p>
-<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./theorem</span> y 0 1 0.1 1</span>
-<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./theorem</span> 1/x 1 2 0.1 0</span>
-<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./theorem</span> <span class="st">&#39;x^2/y+x&#39;</span> 0 1 0.1 6</span></code></pre></div>
+<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./theorem</span> y 0 1 0.1 1</span>
+<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./theorem</span> 1/x 1 2 0.1 0</span>
+<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./theorem</span> <span class="st">&#39;x^2/y+x&#39;</span> 0 1 0.1 6</span></code></pre></div>
 <p>But wait, there is more! You also get, free of charge, a
 reversing filter! Try:</p>
-<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./theorem</span> <span class="at">-r</span> 0 0 0 0 <span class="op">&lt;</span> theorem.c <span class="op">&gt;</span> sorter.c</span></code></pre></div>
+<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./theorem</span> <span class="at">-r</span> 0 0 0 0 <span class="op">&lt;</span> theorem.c <span class="op">&gt;</span> sorter.c</span></code></pre></div>
 <p>Still not impressed? The author throws in for free, a
 sort program! Try:</p>
-<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> sorter</span>
-<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a><span class="fu">ls</span> <span class="kw">|</span> <span class="ex">./sorter</span></span></code></pre></div>
+<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>    <span class="fu">make</span> sorter</span>
+<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a>    <span class="fu">ls</span> <span class="kw">|</span> <span class="ex">./sorter</span></span></code></pre></div>
 <p>This program is safe for home use as well. The author has
 included a safety feature in case you misplace the original
 program source:</p>
-<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sorter</span> <span class="at">-r</span> 0 0 0 0 <span class="op">&lt;</span> sorter.c <span class="op">&gt;</span> theorem_bkp.c</span></code></pre></div>
+<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./sorter</span> <span class="at">-r</span> 0 0 0 0 <span class="op">&lt;</span> sorter.c <span class="op">&gt;</span> theorem_bkp.c</span></code></pre></div>
 <p>And finally, as a special offer to users of this entry,
 the author provides a Fibonacci sequence generator! Try:</p>
-<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sorter</span> 0 0 0 0 <span class="op">&lt;</span> theorem.c <span class="op">&gt;</span> fibonacci.c</span>
-<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> fibonacci</span>
-<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a><span class="ex">./fibonacci</span> 1 1</span>
-<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a><span class="ex">./fibonacci</span> 2 1</span></code></pre></div>
+<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./sorter</span> 0 0 0 0 <span class="op">&lt;</span> theorem.c <span class="op">&gt;</span> fibonacci.c</span>
+<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a>    <span class="fu">make</span> fibonacci</span>
+<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./fibonacci</span> 1 1</span>
+<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./fibonacci</span> 2 1</span></code></pre></div>
 <p>NOTE: if the two args passed to <code>fibonacci</code> and <code>theorem_bkp</code> add to 0 it will
 print 0 over and over again in an infinite loop. In this case it should not be
 fixed (another condition where this occurred was fixed in 2023 as it affected