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.

1993/leo/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Leonid_A_Broukhis">Leonid A. Broukhis</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 -->
@@ -142,12 +141,12 @@ 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>
 <p>To have the computer guess:</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">./leo</span> <span class="pp">[</span><span class="ss">colors</span><span class="pp">]</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">./leo</span> <span class="pp">[</span><span class="ss">colors</span><span class="pp">]</span></span></code></pre></div>
 <p>To guess the computer’s number:</p>
-<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">./mind</span> <span class="pp">[</span><span class="ss">colors</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">./mind</span> <span class="pp">[</span><span class="ss">colors</span><span class="pp">]</span></span></code></pre></div>
 <p>where:</p>
 <p>[colors] is the number of possible colors (1 to 15) (default: 6)</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -181,31 +180,31 @@ backspaces. Do “disable scrolling” on cmdtool or similar emulators.</p>
 <h4 id="bugs">Bugs</h4>
 <p>Please don’t type ^D at the prompt!!</p>
 <h5 id="example-suppose-we-think-of-1234">EXAMPLE: Suppose we think of 1234</h5>
-<pre><code>$ ./leo
-(1296): 6433
-?? 12       # one 3 is a bull, another is a cow, and 4 is a cow
-(160): 5363
-?? 02       # both 3&#39;s are cows
-(21): 4231
-?? 22       # 2 and 3 are bulls, 4 and 1 are cows
-(2): 4132
-?? 13       # 3 is a bull; 1, 2 and 4 are cows
-(1): 1234
-?? 40       # you may enter everything there</code></pre>
+<pre><code>    $ ./leo
+    (1296): 6433
+    ?? 12       # one 3 is a bull, another is a cow, and 4 is a cow
+    (160): 5363
+    ?? 02       # both 3&#39;s are cows
+    (21): 4231
+    ?? 22       # 2 and 3 are bulls, 4 and 1 are cows
+    (2): 4132
+    ?? 13       # 3 is a bull; 1, 2 and 4 are cows
+    (1): 1234
+    ?? 40       # you may enter everything there</code></pre>
 <h5 id="example-guess-the-computers-number">EXAMPLE: Guess the computer’s number</h5>
-<pre><code>$ ./mind
-(1296): ???? 1122   # my strategy isn&#39;t the best, just as example
-00
-(256): ???? 3344
-20
-(18): ???? 5566
-02
-(6): ???? 3654
-11
-(2): ???? 3355
-00
-(1): ???? 6444
-40                 # we have guessed the number</code></pre>
+<pre><code>    $ ./mind
+    (1296): ???? 1122   # my strategy isn&#39;t the best, just as example
+    00
+    (256): ???? 3344
+    20
+    (18): ???? 5566
+    02
+    (6): ???? 3654
+    11
+    (2): ???? 3355
+    00
+    (1): ???? 6444
+    40             # we have guessed the number</code></pre>
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