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.

2000/anderson/README.md

@@ -6,16 +6,13 @@ Desa Bojong
 Cikupa, Tangerang, 15710  
 Indonesia  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) changed this entry to
-use `fgets()` instead of `gets()` to make it safer and to prevent annoying
-warnings from showing up at linking or runtime. Thank you Cody!
-
 
 ## To run:
 
@@ -23,12 +20,14 @@ warnings from showing up at linking or runtime. Thank you Cody!
 echo something | ./anderson
 ```
 
+
 ## Try:
 
 ```sh
 echo Obfuscate | ./anderson
 ```
 
+
 ## Judges' remarks:
 
 This small program might be a nice addition to a digital personal
@@ -40,6 +39,7 @@ very cleverly obscured without the use of a single `#define`!
 Reformatting this program by hand :-) is the easiest way to understand
 what is going on.
 
+
 ## Author's remarks:
 
 This program is a simple filter that translates ASCII text into
@@ -91,6 +91,7 @@ This program is a great teaching tool for learning the semaphore code;
 and if you don't have any flags handy you can just use two copies of the
 source file.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.