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.

1992/albert/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```sh
+```<!---sh-->
     make all
 ```
 
@@ -21,14 +21,14 @@ For more detailed information see [1992 albert bugs](../../bugs.html#1992_albert
 
 ## To use:
 
-```sh
+```<!---sh-->
     ./albert number
 ```
 
 
 ## Try:
 
-```sh
+```<!---sh-->
     ./try.sh
 ```
 
@@ -64,7 +64,7 @@ The [albert.alt.c](albert.c) file is the fixed file, whereas the
 
 To compile this alternate version:
 
-```sh
+```<!---sh-->
     make alt
 ```
 
@@ -76,7 +76,7 @@ Use `albert.alt` as you would `albert` above.
 
 ### Alternate try:
 
-```sh
+```<!---sh-->
     ./try.alt.sh
 ```
 
@@ -106,7 +106,7 @@ if you want to factor Fermat's 4th number. Then just run it.
 Or you may type `./albert <some-number>`
 A nice one is also (30 ones):
 
-```sh
+```<!---sh-->
     ./albert 111111111111111111111111111111
 ```
 
@@ -114,7 +114,7 @@ Apart from the foregoing there are no special execution instructions.
 
 To customize the program into a factorizer of a fixed number, use
 
-```sh
+```<!---sh-->
     cc albert.c -o 4294967297
 ```