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.

2013/cable1/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```sh
+```<!---sh-->
     make
 ```
 
 
 ## To use:
 
-```sh
+```<!---sh-->
     ./cable1 name group1 group2
 ```
 
 
 ## Try:
 
-```sh
+```<!---sh-->
     ./try.sh
 ```
 
@@ -26,39 +26,39 @@ We need not limit ourselves to the two major political parties in the US today.
 
 Let us consider:
 
-```sh
+```<!---sh-->
     ./cable1 Cooper Mac PC
 ```
 
 Simon works for Apple, so you would expect Mac.  :-)
 Landon is a long time Mac user:
 
-```sh
+```<!---sh-->
     ./cable1 Noll Mac PC
 ```
 
 That works too!  Now Leo brings PCs to the IOCCC judging for cross-platform
 testing:
 
-```sh
+```<!---sh-->
     ./cable1 Broukhis Mac PC
 ```
 
 We can test other people.  The late Steve Jobs:
 
-```sh
+```<!---sh-->
     ./cable1 Jobs Mac PC
 ```
 
 That works!  How about Bill?
 
-```sh
+```<!---sh-->
     ./cable1 Gates Mac PC
 ```
 
 A PC guy as expected.  What about that other Steve?
 
-```sh
+```<!---sh-->
     ./cable1 Ballmer Mac PC
 ```
 

2013/cable1/index.html

@@ -141,28 +141,28 @@ 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">./cable1</span> name group1 group2</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 name group1 group2</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>Partisan may be defined as a strong supporter of a cause, party or person.
 We need not limit ourselves to the two major political parties in the US today.</p>
 <p>Let us consider:</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="ex">./cable1</span> Cooper Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Cooper Mac PC</code></pre>
 <p>Simon works for Apple, so you would expect Mac. :-)
 Landon is a long time Mac user:</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">./cable1</span> Noll Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Noll Mac PC</code></pre>
 <p>That works too! Now Leo brings PCs to the IOCCC judging for cross-platform
 testing:</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="ex">./cable1</span> Broukhis Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Broukhis Mac PC</code></pre>
 <p>We can test other people. The late Steve Jobs:</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">./cable1</span> Jobs Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Jobs Mac PC</code></pre>
 <p>That works! How about Bill?</p>
-<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">./cable1</span> Gates Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Gates Mac PC</code></pre>
 <p>A PC guy as expected. What about that other Steve?</p>
-<div class="sourceCode" id="cb9"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>    <span class="ex">./cable1</span> Ballmer Mac PC</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Ballmer Mac PC</code></pre>
 <p>Humm .. maybe there is a hidden reason he is leaving the late Micro$oft? :-)
 Why late? Because:</p>
 <figure>