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.

1991/brnstnd/README.md

@@ -3,20 +3,13 @@
 Daniel J. Bernstein  
 New York University  
 
+
 ## To build:
 
 ```sh
 make all
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this for modern
-systems. There were two invalid operands to binary expression (`char *` and
-`void` and `int` and `void`) to resolve and additionally a mis-feature of the C
-pre-processor which no longer works had to be changed as well in order to get
-this to compile. In particular the macro `C`, defined as `C =G` to make `+=` and
-similar operators no longer works.  The invalid operands to binary expressions
-were resolved with the comma operator. Thank you Cody for your assistance!
-
 
 ## Try:
 
@@ -44,6 +37,7 @@ this entry.
 To have a chance to compile under a modern CPP, we had to
 replace `#D` with `#define`.
 
+
 ## Author's remarks:
 
 This is an interpreter for the programming language SORTA, a systems
@@ -184,6 +178,7 @@ matching, reading from files into strings, and encrypting the string
 pool to further confuse the judges. I don't think I can fit this into
 the size limit, unfortunately.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.