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.

2012/deckmyn/deckmyn.html

@@ -124,7 +124,7 @@
 
 <h1 id="user-manual">USER MANUAL</h1>
 <h2 id="calling-the-program">Calling the program</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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> musicfile<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> output.pbm</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="ex">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> musicfile<span class="kw">`</span><span class="st">&quot;</span> <span class="op">&gt;</span> output.pbm</span></code></pre></div>
 <p>Then display <code>output.pbm</code>.</p>
 <p>This minimalistic music notator expects two command line arguments. The first is
 the font description embedded in the source code. Notice that you don’t pass the
@@ -186,9 +186,9 @@ clef. <code>"K"</code> followed by any other letter will just default to a stand
 </ol>
 <h2 id="examples">Examples</h2>
 <p>Blank music paper (with G clef):</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">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;sz sa x  s1 x  s1 x  s1 x  s1 x  s1 &quot;</span><span class="op">&gt;</span> blank.pbm</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">./deckmyn</span> <span class="st">&quot;</span><span class="kw">`</span><span class="fu">cat</span> deckmyn.c<span class="kw">`</span><span class="st">&quot;</span> <span class="st">&quot;sz sa x  s1 x  s1 x  s1 x  s1 x  s1 &quot;</span><span class="op">&gt;</span> blank.pbm</span></code></pre></div>
 <p>With an F clef:</p>
-<pre><code>./deckmyn &quot;`cat deckmyn.c`&quot; &quot;KF sz sa x  s1 x  s1 x  s1 x  s1 x  s1 &quot;&gt; blank.pbm</code></pre>
+<pre><code>    ./deckmyn &quot;`cat deckmyn.c`&quot; &quot;KF sz sa x  s1 x  s1 x  s1 x  s1 x  s1 &quot;&gt; blank.pbm</code></pre>
 <p>Notice how only the first staff (or any staff) needs to have the full length.</p>
 <p>Some files with well-known melodies are included as examples.</p>
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