move fix thanks a file, update top level html links, rename CONTRIBUTING.md

The fix thank you's have been moved from `README.md` to
`thanks-for-fixes.md`.

**WARNING**: Some mistakes may have been made in doing this.
We presume later changes by others will correct any issues.

The `CONTRIBUTING.md` was renamed `how-to-enter.md`.

A 3rd line of links was added to top level html such as
`contact.html`, `index.html`, `judges.html`, `winners.html`,
and `years.html`.

Improved blank line use in a number (but not all) `README.md` files.

years.html

@@ -8,21 +8,27 @@
 
 <BODY TEXT="#000000">
 
-<CENTER><IMG ALT="IOCCC" SRC="png/ioccc.png"></CENTER>
-<BR>
+<CENTER><a HREF="2011/zucker/hint.html"><IMG ALT="IOCCC" SRC="png/ioccc.png"></a><br><FONT SIZE="1">Logo by winner <a href="2011/zucker/hint.html">Matt Zucker</a></font></CENTER><BR>
 <CENTER><FONT SIZE="6"><I>The International Obfuscated C Code
-Contest </I></FONT></CENTER>
-<BR>
-<CENTER><P>[ <A HREF="judges.html">The judges</A> |
-<A HREF="main.html">IOCCC home page</A> |
-<A HREF="main.html#enter">How to enter</A> |
+Contest </I></FONT></CENTER><BR>
+
+<P>
+<CENTER>
+<A HREF="judges.html">The judges</A> |
+<A HREF="index.html">IOCCC home page</A> |
 <A HREF="faq.html">FAQ</A> |
+<A HREF="index.html#enter">How to enter</A> |
 <A HREF="contact.html">Contacting the IOCCC</A>
-<BR>
-<A HREF="main.html#new">IOCCC news</A> |
+<BR><BR>
+<A HREF="index.html#news">IOCCC news</A> |
 <A HREF="winners.html">People who have won</A> |
-<B>Winning entries</B> ]</P></CENTER>
-<BR>
+<B>Winning entries</B>
+<BR><BR>
+<A HREF="bugs.md">Known Bugs &amp; (Mis)features</A> |
+<A HREF="how-to-bugfix.md">How to fix an IOCCC winner</A> |
+<A HREF="thanks-for-fixes.md">Thanks for the fixes</A> |
+<A HREF="www-history.md">A bit of web site history</A>
+</CENTER>
 
 <DIV style="margin-left:10%; margin-right:10%;" align="center"> [ <A HREF="#2020">2020</A> | <A HREF="#2019">2019</A> | <A HREF="#2018">2018</A> | <A HREF="#2015">2015</A> | <A HREF="#2014">2014</A> | <A HREF="#2013">2013</A> | <A HREF="#2012">2012</A> | <A HREF="#2011">2011</A> | <A HREF="#2006">2006</A> | <A HREF="#2005">2005</A> | <A HREF="#2004">2004</A> | <A HREF="#2001">2001</A> | <A HREF="#2000">2000</A> | <A HREF="#1998">1998</A> | <A HREF="#1996">1996</A> | <A HREF="#1995">1995</A> | <A HREF="#1994">1994</A> | <A HREF="#1993">1993</A> | <A HREF="#1992">1992</A> | <A HREF="#1991">1991</A> | <A HREF="#1990">1990</A> | <A HREF="#1989">1989</A> | <A HREF="#1988">1988</A> | <A HREF="#1987">1987</A> | <A HREF="#1986">1986</A> | <A HREF="#1985">1985</A> | <A HREF="#1984">1984</A> | <A HREF="#ALL">ALL</A> ] </DIV>