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.

2019/diels-grabsch1/README.md

@@ -3,17 +3,13 @@
 Volker Diels-Grabsch  
 <https://njh.eu>  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made the author's
-statement that the entry compiles cleanly true by fixing `warning: a function
-declaration without a prototype is deprecated in all versions of C ` (in
-main()). Not strictly necessary but if he's making fixes he might as well. Thank
-you Cody!
 
 ## To run:
 
@@ -21,6 +17,7 @@ you Cody!
 ./prog < file > file.Z
 ```
 
+
 ## Try:
 
 ```sh
@@ -35,6 +32,7 @@ cmp ref.Z dg1.Z # Oops, the files differ
 zcat < dg1.Z | cmp - ../mills/Shakespeare.txt # Decompresses correctly. What is going on?
 ```
 
+
 ## Judges' remarks:
 
 Finally, IOCCC now has its own text compression program, and it is short enough
@@ -46,6 +44,7 @@ Can you explain why the zero file compresses identically by the entry and the
 standard compress tool, but the text file compresses differently? The judges
 know. :)
 
+
 ## Author's remarks:
 
 ### A tiny "compress" tool:
@@ -77,6 +76,7 @@ right now. And exactly the same shape. Nevertheless, it is portable C99 code
 that runs on 32-bit and 64-bit platforms. It compiles without warnings on both
 GCC and Clang even with `-Wextra and -Weverything`.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.