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.

1996/schweikh1/index.html

@@ -132,8 +132,7 @@
 <h2 id="author"><a name="author"></a>Author:</h2>
 <ul>
 <li>Name: <a href="../../authors.html#Jens_Schweikhardt">Jens Schweikhardt</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 -->
@@ -142,13 +141,13 @@ 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> 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>
-<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">./schweikh1</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">./schweikh1</span></span></code></pre></div>
 <h2 id="try">Try:</h2>
 <p>To find the day that Easter falls on in the current year and to show all Easter
 dates from 1582 to 2199:</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">./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>Look at the source. There is something very odd going on here.
 Where does the real code come from if everything is a C pre-processor
@@ -167,31 +166,30 @@ ueber das Weltall” ‘Handbook About Space’, Meyer, 5th Edition, 1973, p149]
 for anni domini within the <a href="https://en.wikipedia.org/wiki/Gregorian_calendar">Gregorian
 Calendar</a>, that is, from ad 1582
 to ad 2199:</p>
-<pre><code>Let J be the year.
-If J is from 1582 to 1699, let M be 22, let N be 2
-If J is from 1700 to 1799, let M be 23, let N be 3
-If J is from 1800 to 1899, let M be 23, let N be 4
-If J is from 1900 to 2099, let M be 24, let N be 5
-If J is from 2100 to 2199, let M be 24, let N be 6
-Let a be the modulus of J divided by 19
-Let b be the modulus of J divided by 4
-Let c be the modulus of J divided by 7
-Let d be the modulus of (19a + M) divided by 30
-Let e be the modulus of (2b + 4c + 6d + N) divided by 7
-</code></pre>
+<pre><code>    Let J be the year.
+    If J is from 1582 to 1699, let M be 22, let N be 2
+    If J is from 1700 to 1799, let M be 23, let N be 3
+    If J is from 1800 to 1899, let M be 23, let N be 4
+    If J is from 1900 to 2099, let M be 24, let N be 5
+    If J is from 2100 to 2199, let M be 24, let N be 6
+    Let a be the modulus of J divided by 19
+    Let b be the modulus of J divided by 4
+    Let c be the modulus of J divided by 7
+    Let d be the modulus of (19a + M) divided by 30
+    Let e be the modulus of (2b + 4c + 6d + N) divided by 7</code></pre>
 <p>The interesting Sunday is either:</p>
-<pre><code>March 22 + d + e   or
-April d + e - 9    (only one of them is a valid date)</code></pre>
+<pre><code>    March 22 + d + e   or
+    April d + e - 9    (only one of them is a valid date)</code></pre>
 <p>with the following exceptions:</p>
-<pre><code>April 26 must always be changed to April 19
-April 25 must be changed to April 18 if d is 28 and a is greater than 10</code></pre>
+<pre><code>    April 26 must always be changed to April 19
+    April 25 must be changed to April 18 if d is 28 and a is greater than 10</code></pre>
 <h3 id="example">Example:</h3>
-<pre><code>J = 1962, M = 24, N = 5
-a = J % 19 == 5
-b = J %  4 == 2
-c = J %  7 == 2
-d = 119 % 30 == 29
-e = 191 % 7 == 2</code></pre>
+<pre><code>    J = 1962, M = 24, N = 5
+    a = J % 19 == 5
+    b = J %  4 == 2
+    c = J %  7 == 2
+    d = 119 % 30 == 29
+    e = 191 % 7 == 2</code></pre>
 <p>March 53 is invalid, so the result is April 22 1962.</p>
 <h3 id="why-i-think-this-is-obfuscated">Why I think this is obfuscated</h3>
 <p>Apart from the calculation of the Easter date, the definition <em>and</em>
@@ -214,7 +212,7 @@ these easy to remember language elements is justified in my opinion.</p>
 <h3 id="the-moral">The moral:</h3>
 <p>Try to be as precise as can be and no one will comprehend what you mean.</p>
 <h4 id="the-formula">The formula:</h4>
-<pre><code>comprehension = 1/(2**precision)</code></pre>
+<pre><code>    comprehension = 1/(2**precision)</code></pre>
 <h4 id="the-interpretation">The interpretation:</h4>
 <p>“Say nothing and everybody will understand.”</p>
 <p>The <code>-I/usr/include</code> in the build file is needed by gcc on Solaris because