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.

1985/sicherman/index.html

@@ -141,19 +141,19 @@ 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>
+<pre class="&lt;!---sh--&gt;"><code>    make all</code></pre>
 <p>There is another version that will be compiled in case the first fails. This
 should happen automatically. See <a href="#alternate-code">Alternate code</a> below for
 more details on it.</p>
 <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">./sicherman</span> <span class="op">&lt;</span> file</span>
-<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a></span>
-<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> foo <span class="kw">|</span> <span class="ex">./sicherman</span></span>
-<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a></span>
-<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./sicherman</span></span>
-<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a>    <span class="co"># type or paste some text, making sure to hit enter after each line typed</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./sicherman &lt; file
+
+    echo foo | ./sicherman
+
+    ./sicherman
+    # type or paste some text, making sure to hit enter after each line typed</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="alternate-code">Alternate code:</h2>
 <p>The <a href="sicherman.alt.c">sicherman.alt.c</a> is a slight change in the fixed version
 (fixed so it does not require <code>-traditional-cpp</code>) in that it has two args to
@@ -164,12 +164,12 @@ audience.</p>
 <h3 id="alternate-build">Alternate build:</h3>
 <p>Although this will be built if the original fails to compile you can do it
 manually like:</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="fu">make</span> alt</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    make alt</code></pre>
 <p>In this case it will be built as <code>sicherman.alt</code>.</p>
 <h3 id="alternate-use">Alternate use:</h3>
-<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">./sicherman.alt</span> <span class="op">&lt;</span> file</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./sicherman.alt &lt; file</code></pre>
 <h3 id="alternate-try">Alternate try:</h3>
-<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">./try.alt.sh</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./try.alt.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>This program abuses the C preprocessor so much that some <code>cpp</code>s fail to strip
 out all of the comments on the first pass! If you were able to understand
@@ -182,7 +182,7 @@ Like the program says, what’s that mean?</p>
 on a line. Now enter the letters ‘n’ through ‘z’. But to borrow a quote
 from Richard Stallman: If you think you understand what this code
 does, then you don’t, so read it again! Explain why:</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">./sicherman</span> <span class="op">&lt;</span> sicherman.c <span class="kw">|</span> <span class="ex">./sicherman</span> <span class="kw">|</span> <span class="fu">diff</span> <span class="at">-</span> ./sicherman.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./sicherman &lt; sicherman.c | ./sicherman | diff - ./sicherman.c</code></pre>
 <p>results in diff reporting a difference on some machines.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>No remarks were provided by the author.</p>