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.

2015/yang/index.html

@@ -141,11 +141,11 @@ 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="bu">echo</span> Some text <span class="kw">|</span> <span class="ex">./prog</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    echo Some text | ./prog</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>Before analysing the code in detail we were able to guess two out of four tests
 this entry uses to tell the 5 languages/flavors apart. Can you find all four?</p>
@@ -157,26 +157,26 @@ so you need not worry about this.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p><code>Fuuko</code> is a <a href="https://en.wikipedia.org/wiki/Starfish">sea star</a> generator. Feed
 her some input through <code>stdin</code> to get lots of sea star patterns on <code>stdout</code>.</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">-O3</span> <span class="at">-std</span><span class="op">=</span>c90 fuuko.c <span class="at">-lm</span> <span class="at">-o</span> fuuko_c90</span>
-<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> IOCCC <span class="kw">|</span> <span class="ex">./fuuko_c90</span> <span class="op">&gt;</span> output_c90.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    cc -O3 -std=c90 fuuko.c -lm -o fuuko_c90
+    echo IOCCC | ./fuuko_c90 &gt; output_c90.c</code></pre>
 <p>If you compile with a C99 compiler instead of C90, the sea stars will
 have eyes.</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="fu">cc</span> <span class="at">-O3</span> <span class="at">-std</span><span class="op">=</span>c99 fuuko.c <span class="at">-lm</span> <span class="at">-o</span> fuuko_c99</span>
-<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> IOCCC <span class="kw">|</span> <span class="ex">./fuuko_c99</span> <span class="op">&gt;</span> output_c99.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    cc -O3 -std=c99 fuuko.c -lm -o fuuko_c99
+    echo IOCCC | ./fuuko_c99 &gt; output_c99.c</code></pre>
 <p>Don’t like <a href="https://en.wikipedia.org/wiki/Starfish">sea stars</a>? Use a C++98
 compiler to get a <a href="https://en.wikipedia.org/wiki/Dango">dango</a> instead.</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">g++</span> <span class="at">-O3</span> <span class="at">-std</span><span class="op">=</span>c++98 fuuko.c <span class="at">-lm</span> <span class="at">-o</span> fuuko_cpp98</span>
-<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> IOCCC <span class="kw">|</span> <span class="ex">./fuuko_cpp98</span> <span class="op">&gt;</span> output_cpp98.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    g++ -O3 -std=c++98 fuuko.c -lm -o fuuko_cpp98
+    echo IOCCC | ./fuuko_cpp98 &gt; output_cpp98.c</code></pre>
 <p>Don’t like <a href="https://en.wikipedia.org/wiki/Dango">dango</a> either? Use a C++11
 compiler to get just <a href="https://en.wikipedia.org/wiki/Circle">circles</a> (or <a href="https://en.wikipedia.org/wiki/Swiss_cheeses_and_dairy_products">Swiss
 cheese</a>, if you
 prefer that).</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">g++</span> <span class="at">-O3</span> <span class="at">-std</span><span class="op">=</span>c++11 fuuko.c <span class="at">-lm</span> <span class="at">-o</span> fuuko_cpp11</span>
-<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> IOCCC <span class="kw">|</span> <span class="ex">./fuuko_cpp11</span> <span class="op">&gt;</span> output_cpp11.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    g++ -O3 -std=c++11 fuuko.c -lm -o fuuko_cpp11
+    echo IOCCC | ./fuuko_cpp11 &gt; output_cpp11.c</code></pre>
 <p>Don’t like any of these patterns? Use a C11 compiler and there will be
 no extra pattern.</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="fu">cc</span> <span class="at">-O3</span> <span class="at">-std</span><span class="op">=</span>c11 fuuko.c <span class="at">-lm</span> <span class="at">-o</span> fuuko_c11</span>
-<span id="cb8-2"><a href="#cb8-2" aria-hidden="true" tabindex="-1"></a>    <span class="bu">echo</span> IOCCC <span class="kw">|</span> <span class="ex">./fuuko_c11</span> <span class="op">&gt;</span> output_c11.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    cc -O3 -std=c11 fuuko.c -lm -o fuuko_c11
+    echo IOCCC | ./fuuko_c11 &gt; output_c11.c</code></pre>
 <p>Regardless of which of these C/C++ dialects you choose, the output
 will all be valid C90 code that reproduces original input on <code>stdout</code>,
 filled with pointer dereferences (C stars).</p>