replace old ASCII > style with markdown code blocks

2018/burton2/index.html

@@ -255,13 +255,11 @@ whitespace surrounds English words, not necessarily C tokens, as in <code>a+=1;<
 designed to allow exhaustive, hand-counted values for comparison with the tool values.
 These test cases were vital in debugging and regression testing, and provided a way to
 determine which tool was correct when there were differences.</p>
-<blockquote>
-<p>A version of this tool in more clearly written C (<a href="tac.c">tac.c</a>)
-is presented for the Judge’s consideration as a more accurate replacement for <code>iocccsize</code>.
-This obfuscated entry is derived from (and compatible with) that code,
-but due to obfuscation, has had some significant, deep changes for the contest.
-Nevertheless, the more clearly written code remains a spoiler for this entry.</p>
-</blockquote>
+<pre><code>    A version of this tool in more clearly written C ([tac.c](tac.c))
+    is presented for the Judge&#39;s consideration as a more accurate replacement for `iocccsize`.
+    This obfuscated entry is derived from (and compatible with) that code,
+    but due to obfuscation, has had some significant, deep changes for the contest.
+    Nevertheless, the more clearly written code remains a spoiler for this entry.</code></pre>
 <p>NB: <code>iocccsize</code> gets a different answer from <code>tac</code> on its own
 (<a href="../../2018/iocccsize.c">iocccsize.c</a>) source code;
 <code>tac</code> gets the correct answer. This is due to the aforementioned bugs within <code>iocccsize</code>,