Format and link fix 2004/arachnid

Fix format of README.md file. I wanted to say that the author is a
sociopath :-) for using 'w', 'a', 's' and 'd' but that's not right in
the README.md (the judges put something amusing there about it anyway)
so I'm doing it here instead. :-) Okay he's not really but the
navigation is difficult to vi users as the judges point out. Still a
very fun game and I didn't get lost!

Fix dead link via Internet Wayback Machine.

Renamed arachnid.info to arachnid.txt. I hope this helps with rendering
later on so that browsers can also view it. There are other entries
where it might have been good to consider this but I did not think of it
at the time.

winners.html

@@ -668,7 +668,7 @@ Contest </I></FONT></CENTER><BR>
 <LI TYPE=square>Most Complete Program (<A HREF="years.html#2000_tomx">2000 tomx</A>)
 </UL><BR>
 
-<LI TYPE=none><A NAME="Nick_Johnson"></A><B><a href="&#x6D;&#97;&#105;&#x6C;&#116;o&#58;&#x61;&#x72;&#97;&#x63;&#104;&#110;&#x69;&#x64;&#64;&#x6E;ot&#x64;&#111;t&#46;&#x6E;&#101;&#x74;">Nick Johnson</a></B> -- <A HREF="http://www.notdot.net/">http://www.notdot.net/</a>
+<LI TYPE=none><A NAME="Nick_Johnson"></A><B><a href="&#x6D;&#97;&#105;&#x6C;&#116;o&#58;&#x61;&#x72;&#97;&#x63;&#104;&#110;&#x69;&#x64;&#64;&#x6E;ot&#x64;&#111;t&#46;&#x6E;&#101;&#x74;">Nick Johnson</a></B> -- <A HREF="https://web.archive.org/web/20051030162356/http://www.notdot.net/">https://web.archive.org/web/20051030162356/http://www.notdot.net/</a>
 <UL>
 <LI TYPE=square>Best use of Vision (<A HREF="years.html#2004_arachnid">2004 arachnid</A>)
 </UL><BR>