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.

index.html

@@ -43,22 +43,28 @@ then consider making pull requests against the
 <A HREF="https://github.com/ioccc-src/temp-test-ioccc">temp-test-ioccc</A> GitHub repo.
 <HR>
 
-<CENTER><P>[ <A HREF="judges.html">The judges</A> |
+<P>
+<CENTER>
+<A HREF="judges.html">The judges</A> |
 <B>IOCCC home page</B> |
-<A HREF="index.html#enter">How to enter</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>
+<BR><BR>
 <A HREF="index.html#news">IOCCC news</A> |
 <A HREF="winners.html">People who have won</A> |
-<A HREF="years.html">Winning entries</A> ]</P></CENTER>
+<A HREF="years.html">Winning entries</A>
+<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>
 
 <P>
 <A NAME="enter"></A>
 <HR>
 
-<P>The <A HREF="years.html#2020">source winners of the 27<sup>th</sup> IOCCC</A> have been released. Congratulations!</P>
-
 <P>The IOCCC is currently <B>CLOSED</B>.</P>
 
 <P>Right now, you <B>CANNOT register</B> as a contestant with the IOCCC,<BR>
@@ -68,6 +74,8 @@ nor can you submit an entry because the <B>IOCCC</B> is yet <B>NOT open</B>.
 
 <P>You may also check on the <A HREF="status.json">status.json</A> for the current status of the <B>IOCCC</B>.
 
+Additional details in the <A HREF="how-to-enter.md">how to enter</A> may be of further help.
+
 <A NAME="goals"></A>
 <HR>