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/blakely/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```sh
+```<!---sh-->
     make
 ```
 
@@ -9,20 +9,20 @@
 
 Zoom out and make your terminal window 53 or more lines deep.
 
-```sh
+```<!---sh-->
     ./blakely < blakely.c | head -300
 ```
 
 
 ## Try:
 
-```sh
+```<!---sh-->
     ./try.sh
 ```
 
 For those who have a lot of time, try:
 
-```sh
+```<!---sh-->
     ./blakely < t0_3.dat
 ```
 
@@ -40,7 +40,7 @@ is a [Garden of Eden](http://en.wikipedia.org/wiki/Garden_of_Eden_%28cellular_au
 If you have enough time to spare, put the plan of your garden in a text file,
 and run:
 
-```sh
+```<!---sh-->
     ./blakely - < garden.txt
 ```
 
@@ -54,7 +54,7 @@ over tabs.
 
 In order to see the main feature of the code, type:
 
-```sh
+```<!---sh-->
     ./blakely < blakely.c
 ```
 
@@ -72,7 +72,7 @@ layout of the source-code is such that it evolves to a digital representation of
 the first 15 decimal places of pi after 4 time steps. This was setup using the
 other feature of the program which can be demonstrated as follows:
 
-```sh
+```<!---sh-->
     ./blakely - < 3.dat
 ```
 
@@ -81,7 +81,7 @@ more grids (taking a few minutes to display the last). Waiting for any more
 grids will take a substantial amount of time. The final grid has been put into
 [evolve_to_3.dat](evolve_to_3.dat), and if you type
 
-```sh
+```<!---sh-->
     ./blakely < evolve_to_3.dat
 ```
 

2011/blakely/index.html

@@ -141,14 +141,14 @@ Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great
 <!-- 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>
 <p>Zoom out and make your terminal window 53 or more lines deep.</p>
-<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">./blakely</span> <span class="op">&lt;</span> blakely.c <span class="kw">|</span> <span class="fu">head</span> <span class="at">-300</span></span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely &lt; blakely.c | head -300</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>
 <p>For those who have a lot of time, try:</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">./blakely</span> <span class="op">&lt;</span> t0_3.dat</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely &lt; t0_3.dat</code></pre>
 <p>though one might or might not need to kill it, depending on your boredom
 threshold.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -158,14 +158,14 @@ if given its own source as input, and allows to check if your garden
 is a <a href="http://en.wikipedia.org/wiki/Garden_of_Eden_%28cellular_automaton%29">Garden of Eden</a>, all in one source.</p>
 <p>If you have enough time to spare, put the plan of your garden in a text file,
 and run:</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">./blakely</span> <span class="at">-</span> <span class="op">&lt;</span> garden.txt</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely - &lt; garden.txt</code></pre>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>This program uses a well-known algorithm in order to display pi to fifteen
 decimal places. The source-layout itself demonstrates the importance of using
 the correct amount of whitespace in code and the clear superiority of spaces
 over tabs.</p>
 <p>In order to see the main feature of the code, type:</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">./blakely</span> <span class="op">&lt;</span> blakely.c</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely &lt; blakely.c</code></pre>
 <p>and wait for about four seconds before using Ctrl-C (or whatever) to end the program. The
 results are best viewed in a terminal window at least 60 characters
 high and wide. Alternatively, redirect the output to a separate file
@@ -176,12 +176,12 @@ Life</a>”, using standard input as a starting grid. The
 layout of the source-code is such that it evolves to a digital representation of
 the first 15 decimal places of pi after 4 time steps. This was setup using the
 other feature of the program which can be demonstrated as follows:</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">./blakely</span> <span class="at">-</span> <span class="op">&lt;</span> 3.dat</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely - &lt; 3.dat</code></pre>
 <p>The program will first display the grid given in <a href="3.dat">3.dat</a>, and then three
 more grids (taking a few minutes to display the last). Waiting for any more
 grids will take a substantial amount of time. The final grid has been put into
 <a href="evolve_to_3.dat">evolve_to_3.dat</a>, and if you type</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">./blakely</span> <span class="op">&lt;</span> evolve_to_3.dat</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./blakely &lt; evolve_to_3.dat</code></pre>
 <p>then the 3 will reappear after three time steps.</p>
 <p>As should now be clear, this use of the program will attempt to evolve a given setup
 backwards in time according to the Life rules. The resulting grid is clearly not