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.

2001/coupard/README.md

@@ -7,18 +7,21 @@ ATTN : Pierre-Philippe Coupard
 Lindon, UT 84042  
 US  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
+
 ## To run:
 
 ```sh
 ./coupard
 ```
 
+
 ## Try:
 
 ```sh
@@ -35,8 +38,6 @@ something like:
 ./coupard | sox -q -traw -r8000 -b8 -e unsigned-integer - -tcoreaudio
 ```
 
-Thanks go to [Yusuke Endoh](/winners.html#Yusuke_Endoh) for providing a proper
-command line (see [/2013/endoh3/README.md](2013/endoh3/README.md).
 
 ## Judges' remarks:
 
@@ -44,6 +45,7 @@ You may need to run this a few times to understand exactly what is
 being said.  You might even need to look somewhere on your desktop,
 your arm or the wall for confirmation.
 
+
 ## Author's remarks:
 
 Past years' IOCCC entries do many marvellous things in small packages,
@@ -159,6 +161,7 @@ When linting the program with `lclint`, it complains about a huge list
 of things that, if corrected to make lint happy, would probably double
 the size of the source code.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.