replace old ASCII > style with markdown code blocks

1984/mullender/README.md

@@ -386,7 +386,7 @@ format randomly. So we wrote a program to choose an appropriate format at
 random. The program we wrote for that follows.  This program actually also
 extracted the machine code from the object file.
 
-> NOTE from judges: see [gentab.c](gentab.c) for a copy of this file that can be
+NOTE from judges: see [gentab.c](gentab.c) for a copy of this file that can be
 compiled in modern systems.
 
 ``` <!---c-->

1984/mullender/index.html

@@ -434,10 +434,8 @@ formats for each constant in the resulting array, and we wanted to choose the
 format randomly. So we wrote a program to choose an appropriate format at
 random. The program we wrote for that follows. This program actually also
 extracted the machine code from the object file.</p>
-<blockquote>
 <p>NOTE from judges: see <a href="gentab.c">gentab.c</a> for a copy of this file that can be
 compiled in modern systems.</p>
-</blockquote>
 <pre><code>    #include &lt;stdio.h&gt;
     #include &lt;a.out.h&gt;