replace old ASCII > style with markdown code blocks

2013/mills/README.md

@@ -92,8 +92,10 @@ Since ray-tracing was an obvious choice to return to a web server, I needed
 something to ray-trace.  A static scene would be uninteresting.  I took
 inspiration (as I often do) from the IOCCC remarks file which says
 
->  At least one judge prefers to maintain the use of the leap-second
->  as part of the world's time standard.
+```
+    At least one judge prefers to maintain the use of the leap-second
+    as part of the world's time standard.
+```
 
 Then it was obvious; the code should display the time.  It is believed (but
 not confirmed) that the code will, in fact, display leap seconds correctly.

2013/mills/index.html

@@ -203,10 +203,8 @@ big-endian encodings at different spec layers.</p>
 <p>Since ray-tracing was an obvious choice to return to a web server, I needed
 something to ray-trace. A static scene would be uninteresting. I took
 inspiration (as I often do) from the IOCCC remarks file which says</p>
-<blockquote>
-<p>At least one judge prefers to maintain the use of the leap-second
-as part of the world’s time standard.</p>
-</blockquote>
+<pre><code>    At least one judge prefers to maintain the use of the leap-second
+    as part of the world&#39;s time standard.</code></pre>
 <p>Then it was obvious; the code should display the time. It is believed (but
 not confirmed) that the code will, in fact, display leap seconds correctly.</p>
 <p>To display the time, of course we would need a font. This font is encoded