replace old ASCII > style with markdown code blocks

1989/paul/index.html

@@ -158,13 +158,11 @@ out. See <a href="#alternate-code">alternate code</a> below for more details.</p
 <pre><code>    ./paul</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>This version was described by the author like:</p>
-<blockquote>
 <p>I could have squeezed the program under 1024 bytes without the
 trace subroutine, but I felt it was important for understanding
 the program. Besides it is fun to watch the tape zooming back
 and forth as the program runs. A much better debugger or trace
 could easily be added.</p>
-</blockquote>
 <h3 id="alternate-build">Alternate build:</h3>
 <pre><code>    make alt</code></pre>
 <h3 id="alternate-use">Alternate use:</h3>