add hack-a-round for language specified markdown code blocks

When language is specified in a markdown code block such as:

````
```c
    printf("Hello, world!\n");
```
````

is used, the resulting HTML as produced by `pandoc(1)` combined
with our revised `ioccc.css` is not intent the code block well.

A temporary "_hack-a-round_" is to turn the "markdown code language
specifier" into an HTML comment.  For example:

````
```<!---c-->
    printf("Hello, world!\n");
```
````

This commits turns off existing markdown code language specifiers
for now, while preserving our ability to restore them in the future
when a better  "_hack-a-round_" to the "markdown code language
specifier" problem is found.

The HTML impact if this "_hack-a-round_" is to produce HTML that
looks like this:

```
<pre class="&lt;!---c--&gt;"><code> .. </code></pre>
```

We might be able to create a complex set of classes for each markdown
code language (there won't be very many) in `ioccc.css`, or we might
find a more general CSS (or maybe `pandoc(1)`?) solution.

For now, this hack-a-round will have to do.

2005/mikeash/index.html

@@ -141,17 +141,17 @@ 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></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    make</code></pre>
 <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>
 <p>For more detailed information see <a href="../../bugs.html#2005_mikeash">2005 mikeash 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">./mikeash</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./mikeash</code></pre>
 <p>NOTE: the author stated that they tested this under i386 machines but this works
 under 64-bit (x86_64, arm64) machines too.</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>
+<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>Having problems speaking code? Do you <a href="https://en.wikipedia.org/wiki/Lisp_(programming_language)">LISP</a>? Parenthetically
 speaking, this entry takes advantage of C99 features, while
@@ -175,12 +175,12 @@ constant string, due to different string escape semantics in C and Lisp, and
 some implicit integer-to-pointer conversions due to the implicitly-declared
 functions.</p>
 <p>Try:</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="bu">echo</span> <span class="st">&#39;(format t &quot;~s&quot; (+ 2 2 ))&#39;</span> <span class="kw">|</span> <span class="ex">./mikeash</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    echo &#39;(format t &quot;~s&quot; (+ 2 2 ))&#39; | ./mikeash</code></pre>
 <p>You should see <code>4"</code> echoed on your command prompt. The <code>"</code> after the 4 and
 the lack of a newline are due to the somewhat broken implementation of
 the format function. More sophisticated arithmetic expressions may be
 used:</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="bu">echo</span> <span class="st">&#39;(format t &quot;~s&quot; (* (+ 2 2 ) (- 5 (/ 9 3 ))))&#39;</span> <span class="kw">|</span> <span class="ex">./mikeash</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    echo &#39;(format t &quot;~s&quot; (* (+ 2 2 ) (- 5 (/ 9 3 ))))&#39; | ./mikeash</code></pre>
 <p>This evaluates the expression <code>(2+2) * (5 - 9/3)</code> giving the correct result,
 <code>8"</code> (with the same issue of no newline after the <code>"</code>). Note that due to the
 highly ad-hoc nature of the tokenizer, the spaces before the closing parentheses
@@ -219,8 +219,8 @@ nowhere near
 </ul>
 <p>Basically, the <a href="https://en.wikipedia.org/wiki/Lisp_(programming_language)">LISP</a> interpreter is good for some basic math operations, and
 for running itself. To do the latter, try this:</p>
-<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./mikeash</span> <span class="op">&lt;</span> mikeash.c <span class="op">&gt;</span> mikeash2.c</span>
-<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a>    <span class="fu">diff</span> mikeash.c mikeash2.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./mikeash &lt; mikeash.c &gt; mikeash2.c
+    diff mikeash.c mikeash2.c</code></pre>
 <p>The program can also be run from an implementation of <a href="https://en.wikipedia.org/wiki/Common_Lisp">common
 lisp</a>. To do
 this, run the common lisp compiler and then type the following command:</p>