update manifest as per recent file changes

2018/burton1/index.html

@@ -297,10 +297,12 @@ environments.</p>
 the operating system it was birthed within. C is often criticized as a
 difficult, inscrutable language, but as this contest demonstrates, this
 is in parody. <em>Shell-gol</em> is one of those instances where someone
-<a href="http://ioccc.org/all/README">preferred a different
-language</a>, and (ab)used the preprocessor to re-mold C into something
-they found comfortable. Most of the rest of the system, especially in
-the kernel, are models of clarity and efficient expression.</p>
+<a
+href="https://web.archive.org/web/20180521074522/http://www.computerworld.com.au/article/279011/a-z_programming_languages_bourne_shell_sh/?pp=4">preferred
+a different language</a>, and (ab)used the preprocessor to re-mold C
+into something they found comfortable. Most of the rest of the system,
+especially in the kernel, are models of clarity and efficient
+expression.</p>
 <h3 id="tldr">TL;DR:</h3>
 <p>So which version is the shortest, portable hex dump?</p>
 <ul>