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.

2004/kopczynski/README.md

@@ -4,22 +4,20 @@ Eryk Kopczynski
 Poland  
 <http://www.mimuw.edu.pl/~erykk/>  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
+
 ## To run:
 
 ```sh
 ./kopczynski < input_file
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) reported that this
-entry cannot be optimised by the compiler if it's to work. He also added the
-file [kopczynski-a](kopczynski-a) to demonstrate what happens when art more like
-a letter is fed to the program. Thank you Cody!
 
 ## Try:
 
@@ -43,6 +41,7 @@ What happens?
 What happens if you feed the program source to the program? Can you figure out
 why?
 
+
 ### Alternate code
 
 The judges modified the program to print its result.  The original
@@ -59,6 +58,7 @@ Then try:
 echo $?
 ```
 
+
 ## Judges' remarks:
 
 What is in a line?  A lot when you obfuscate the way Eryk Kopczynski
@@ -84,6 +84,7 @@ Here is a related puzzle: how to continue the sequence:
 With certain arguments, you can alter the exit value / output.  Can you figure
 out how and why?
 
+
 ## Author's remarks:
 
 The program proves it is not as hard to recognize numbers. The current
@@ -196,6 +197,7 @@ figuring how arguments can be used to alter the exit value.
 10. Finally, the program tries to be as concise as possible. Some obfuscation
 comes from this. For additional obfuscation and conciseness, `if` means `while`.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.