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/hou/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Qiming_HOU">Qiming HOU</a><br>
-Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of China</em> (<em>China</em>)
-<br><br></li>
+Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of China</em> (<em>China</em>)</li>
 </ul>
 
 <!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,18 +141,18 @@ Location: <a href="../../location.html#CN">CN</a> - <em>People’s Republic of C
 <!-- 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#2013_hou">2013 hou 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">./hou</span> <span class="pp">[</span><span class="ss">scene</span><span class="pp">-</span><span class="ss">file</span><span class="pp">-</span><span class="ss">name</span><span class="pp">]</span> <span class="pp">[</span><span class="ss">options</span><span class="pp">]</span></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">./hou</span> <span class="pp">[</span><span class="ss">scene</span><span class="pp">-</span><span class="ss">file</span><span class="pp">-</span><span class="ss">name</span><span class="pp">]</span> <span class="pp">[</span><span class="ss">options</span><span class="pp">]</span></span></code></pre></div>
 <p>Follow the instructions in <code>stdout</code>, preferably with an auto-refreshing PPM
 image viewer ready. Refresh the image every time the output refreshes, all
 effects should be more or less recognizable when you see 16.</p>
 <h2 id="try">Try:</h2>
-<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
+<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./try.sh</span></span></code></pre></div>
 <p>Try opening the file noted by the program then let the program run a while and
 every so often reopen the file, to see how it changes. The author suggests that
 you leave the program running overnight to see what happens. If however you do
@@ -182,15 +181,15 @@ program.</p>
 <a href="https://en.wikipedia.org/wiki/Ray_tracing_(graphics)">raytraced</a> image.</p>
 <p>NOTE: the author refers to <a href="a.c">a.c</a>, placed in a gzipped file <code>a.c.gz</code>. We do not
 include it but it can be generated like:</p>
-<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="fu">cc</span> <span class="at">-Wall</span> hou.c <span class="at">-o</span> hou <span class="at">-lm</span></span>
-<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./hou</span> <span class="op">&gt;</span> a.c</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="fu">cc</span> <span class="at">-Wall</span> hou.c <span class="at">-o</span> hou <span class="at">-lm</span></span>
+<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./hou</span> <span class="op">&gt;</span> a.c</span></code></pre></div>
 <p>but there is no need to do this as the Makefile takes care of it without even
 needing to create a temporary file.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="using-hou">Using hou</h3>
 <p>This program is a programmable rendering engine with a built-in default scene.
 The standard command line is:</p>
-<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./hou</span> <span class="pp">[</span><span class="ss">scene</span><span class="pp">-</span><span class="ss">file</span><span class="pp">-</span><span class="ss">name</span><span class="pp">]</span> <span class="pp">[</span><span class="ss">options</span><span class="pp">]</span></span></code></pre></div>
+<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./hou</span> <span class="pp">[</span><span class="ss">scene</span><span class="pp">-</span><span class="ss">file</span><span class="pp">-</span><span class="ss">name</span><span class="pp">]</span> <span class="pp">[</span><span class="ss">options</span><span class="pp">]</span></span></code></pre></div>
 <p>As <code>hou</code> runs, it writes a progressively refining image to a ppm file specified
 in the scene. The initialization may take a while, but once it’s done, a rough
 preview should be available in seconds. Leave <code>hou</code> running for the night, and you
@@ -280,11 +279,11 @@ quite memory consuming, requires IEEE754-compliant <code>double</code>, and assu
 doesn’t copy saved sessions across different endianness.</li>
 </ul>
 <h3 id="spoiler">Spoiler</h3>
-<pre><code> 3225  3225  3225  9  9    3225  3225
- 1     1  1  1  1  1  1    1     1  1
- 4225  1226  1  1  1  1    1222  1226
-    1  1     1  1  1  1    1     1 1
- 4226  1     4226  8  4222 4226  1  1</code></pre>
+<pre><code>    3225  3225  3225  9  9    3225  3225
+    1     1  1  1  1  1  1    1     1  1
+    4225  1226  1  1  1  1    1222  1226
+       1  1     1  1  1  1    1     1 1
+    4226  1     4226  8  4222 4226  1  1</code></pre>
 <p>The program consists of a recursive-descent interpreter, a <code>3DDDA</code> (3D Discrete
 Differential Analysis) ray tracer, a <code>PSSMLT</code> (Primary Sample Space Metropolis
 Light Transport) light path sampler, all squeezed into the size limit using a