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.

2004/jdalbec/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```sh
+```<!---sh-->
     make
 ```
 
@@ -21,14 +21,14 @@ For more detailed information see [2004 jdalbec bugs](../../bugs.html#2004_jdalb
 
 ## To use:
 
-```sh
+```<!---sh-->
     ./jdalbec number ...
 ```
 
 
 ## Try:
 
-```sh
+```<!---sh-->
     ./try.sh
 ```
 
@@ -43,7 +43,7 @@ which line it is on.
 
 ### Alternate build:
 
-```sh
+```<!---sh-->
     make alt
 ```
 
@@ -52,7 +52,7 @@ many number of lines to print on a line. Set at default to 11 protons, salt, if
 you wish to make it silver, 47 (a prime) protons, do:
 
 
-```sh
+```<!---sh-->
     make clobber Ag=47 alt
 ```
 
@@ -60,7 +60,7 @@ though it might be odd to have 47 numbers on a line as it would defeat the
 purpose. :-) Or if you prefer some prime, golden irony:
 
 
-```sh
+```<!---sh-->
     make clobber Ag=79 alt
 ```
 
@@ -72,7 +72,7 @@ Use `jdalbec.alt` as you would `jdalbec` above.
 
 ### Alternate try:
 
-```sh
+```<!---sh-->
     ./try.alt.sh
 ```
 

2004/jdalbec/index.html

@@ -141,7 +141,7 @@ 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>
 <p>There is an alternate version that allows one to control the number of numbers
 to print on a line. See <a href="#alternate-code">alternate code</a> below.</p>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
@@ -149,27 +149,27 @@ to print on a line. See <a href="#alternate-code">alternate code</a> below.</p>
 <pre><code>    STATUS: INABIAF - please **DO NOT** fix</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#2004_jdalbec">2004 jdalbec bugs</a>.</p>
 <h2 id="to-use">To use:</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">./jdalbec</span> number ...</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    ./jdalbec number ...</code></pre>
 <h2 id="try">Try:</h2>
-<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">./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>This version lets you control how many numbers to show on a line before adding a
 newline as it can be harder to see when there are a lot of numbers. For lines
 that don’t end up having too many line breaks it also makes it easier to see
 which line it is on.</p>
 <h3 id="alternate-build">Alternate build:</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="fu">make</span> alt</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    make alt</code></pre>
 <p>The macro <code>Ag</code> (<a href="https://en.wikipedia.org/wiki/Silver">silver</a>) controls how
 many number of lines to print on a line. Set at default to 11 protons, salt, if
 you wish to make it silver, 47 (a prime) protons, do:</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="fu">make</span> clobber Ag=47 alt</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    make clobber Ag=47 alt</code></pre>
 <p>though it might be odd to have 47 numbers on a line as it would defeat the
 purpose. :-) Or if you prefer some prime, golden irony:</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="fu">make</span> clobber Ag=79 alt</span></code></pre></div>
+<pre class="&lt;!---sh--&gt;"><code>    make clobber Ag=79 alt</code></pre>
 <h3 id="alternate-use">Alternate use:</h3>
 <p>Use <code>jdalbec.alt</code> as you would <code>jdalbec</code> above.</p>
 <h3 id="alternate-try">Alternate try:</h3>
-<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">./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>We still aren’t sure whether or not this is a useful program, but
 it’s the first atomic fission we’ve seen in the IOCCC.</p>