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.

1998/dorssel/index.html

@@ -141,14 +141,14 @@ Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></l
 <!-- 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>
+<pre class="&lt;!---sh--&gt;"><code>    make all</code></pre>
 <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">./dorssel</span></span>
-<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>    <span class="co"># input some text</span></span>
-<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a></span>
-<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> text <span class="kw">|</span> <span class="ex">./dorssel</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./dorssel
+    # input some text
+
+    echo text | ./dorssel</code></pre>
 <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>
+<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>How does the program decide which way to convert?</p>
 <p>What obsolescent feature are we talking about? (No, it’s not a
@@ -166,8 +166,8 @@ altering the behavior ?</p></li>
 <h3 id="extra-credit">Extra credit:</h3>
 <p>Try doing what the last part of the last command in <a href="try.sh">try.sh</a> suggests.
 As in, do the following:</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="bu">echo</span> <span class="st">&quot;. -..- . .-. -.-. .. ... .</span></span>
-<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="st">    -.-. .... .- -. --. .  - .... .  .--. .-. --- --. .-. .- --  ... ---  .. -  -.. --- . ...  -. --- -  ... .... --- ..- -&quot;</span> <span class="kw">|</span> <span class="ex">./dorssel</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    echo &quot;. -..- . .-. -.-. .. ... .
+    -.-. .... .- -. --. .  - .... .  .--. .-. --- --. .-. .- --  ... ---  .. -  -.. --- . ...  -. --- -  ... .... --- ..- -&quot; | ./dorssel</code></pre>
 <p>and make the necessary adjustments.</p>
 <p>You might also want to read the <a href="dorssel.html">dorssel.html</a> file.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
@@ -195,21 +195,21 @@ ASCII. As far as I can tell, the program is conforming and does not
 invoke undefined behavior.</p>
 <h3 id="hints">Hints</h3>
 <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="ex">./dorssel</span> <span class="op">&lt;</span> dorssel.c <span class="kw">|</span> <span class="ex">./dorssel</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
 <p>to see what variables, numbers, and functions are used. (Does a
 better job than most C beautifiers).</p>
 <ul>
 <li>Filter your text twice (as in the previous sample) to obtain a version of your
 text that can be reversibly Morsified, i.e.</li>
 </ul>
-<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="ex">./dorssel</span> <span class="op">&lt;</span> dorssel.c <span class="kw">|</span> <span class="ex">./dorssel</span> <span class="kw">|</span> <span class="ex">./dorssel</span> <span class="kw">|</span> <span class="ex">./dorssel</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./dorssel &lt; dorssel.c | ./dorssel | ./dorssel | ./dorssel</code></pre>
 <p>is the same as</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">./dorssel</span> <span class="op">&lt;</span> dorssel.c <span class="kw">|</span> <span class="ex">./dorssel</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
 <ul>
 <li>The file <a href="dorssel.md">dorssel.md</a> contains all the information needed to
 understand this program. For an obfuscated spoiler, try</li>
 </ul>
-<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./dorssel</span> <span class="op">&lt;</span> dorssel.md</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./dorssel &lt; dorssel.md</code></pre>
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