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.

2019/diels-grabsch2/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Volker_Diels-Grabsch">Volker Diels-Grabsch</a><br>
-Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)
-<br><br></li>
+Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)</li>
 </ul>
 
 <!-- END: next line ends content generated by: bin/output-index-author.sh -->
@@ -142,11 +141,11 @@ Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germ
 <!-- 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>
-<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">./prog</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">./prog</span></span></code></pre></div>
 <h2 id="try">Try:</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">./try.sh</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">./try.sh</span></span></code></pre></div>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>Before running this one, stay calm. Chill out, have a cup of tea. Is this bad?</p>
 <p>To understand what is going on here, please check if you are dreaming, or are you dreaming
@@ -154,9 +153,9 @@ that you are dreaming? Or is it, wake up from the simulation?</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="almost-a-hash-collision">Almost a hash collision:</h3>
 <p>This program prints its own SHA-512 hash. To verify, run:</p>
-<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">$</span> sha512sum prog.c<span class="kw">;</span> <span class="ex">./prog</span></span>
-<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="ex">43bd0c4381a5078d2850fca9ae5e0647596bcc03cd67d8d973ad02ff35c316c728e7b347ca70abe6c74e745e63646cc7643cb0cffcd3d9a969cbf31a7ce5bf68</span>  prog.c</span>
-<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="ex">43bd0c4381a5078d2850fca9ae5e0647596bcc03cd67d8d973ad02ff35c316c728e7b347ca70abe6c74e745e63646cc7643cb0cffcd3d9a969cbf31a7ce5bf68</span></span></code></pre></div>
+<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">$</span> sha512sum prog.c<span class="kw">;</span> <span class="ex">./prog</span></span>
+<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a>    <span class="ex">43bd0c4381a5078d2850fca9ae5e0647596bcc03cd67d8d973ad02ff35c316c728e7b347ca70abe6c74e745e63646cc7643cb0cffcd3d9a969cbf31a7ce5bf68</span>  prog.c</span>
+<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a>    <span class="ex">43bd0c4381a5078d2850fca9ae5e0647596bcc03cd67d8d973ad02ff35c316c728e7b347ca70abe6c74e745e63646cc7643cb0cffcd3d9a969cbf31a7ce5bf68</span></span></code></pre></div>
 <p>It started as a complicated “hello world” program that prints some random hex
 digits instead of “hello world”. Then, the digits were adjusted until the
 resulting program matched its own SHA-512 hash, via brute force through all
@@ -181,7 +180,7 @@ the <code>#define</code>s are only used to shorten redundant parts of the code,
 they are not meant to obfuscate much. Having that out of the way, how
 are step 1 and step 2 achieved then?</p>
 <p>Regarding step 1, note that the large string literal</p>
-<pre><code>&quot;`x{bh}ndbq...&quot;</code></pre>
+<pre><code>    &quot;`x{bh}ndbq...&quot;</code></pre>
 <p>in the last line doesn’t look like C code. Moreover, it is too short
 to contain even a compressed representation of all preceding and
 subsequent code. Instead, the preceding code including the <code>"</code>