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.

2011/eastman/index.html

@@ -141,14 +141,14 @@ 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>
 <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">./eastman</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./eastman</code></pre>
 <p>NOTE: to restore your cursor in your shell, try <code>reset</code>.</p>
 <h2 id="try">Try:</h2>
 <p>Run the program. Quit it (ctrl-c/intr). Resize your terminal window. Run it
 again. Try doing this a number of times with different sizes each time.</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">./eastman</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./eastman</code></pre>
 <p>NOTE: to restore your cursor in your shell, try <code>reset</code>.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>This round program will generate a classic spherical result!</p>
@@ -173,7 +173,7 @@ is also just part of the texture, not an actual raytraced shadow.</p>
 so try enlarging the window to get higher resolution. Don’t resize while the
 program is running, though. It only checks the size once, when it starts up.</p>
 <p>To compile:</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">cc</span> <span class="at">-lm</span> eastman.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    cc -lm eastman.c</code></pre>
 <h3 id="portability">Portability</h3>
 <p>It should be completely portable. I’ve tested with gcc on Mac OS X 10.7 (Lion)
 and Fedora 10. I would expect it to work in any Unix-like environment.</p>