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.

2015/yang/README.md

@@ -3,15 +3,13 @@
 Don Yang   
 <http://uguu.org/>  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed an unfortunate
-typo in the Makefile that was preventing some of the files from compiling
-properly, trying instead to compile already compiled code. Thank you Cody!
 
 ## To run:
 
@@ -19,6 +17,7 @@ properly, trying instead to compile already compiled code. Thank you Cody!
 echo Some text | ./prog 
 ```
 
+
 ## Try:
 
 ```sh
@@ -57,6 +56,7 @@ NOTE: the author calls the program `Fuuko` and so the source file referred to in
 their remarks uses `fuuko.c`. The [Makefile](Makefile) will compile everything
 so you need not worry about this.
 
+
 ## Author's remarks:
 
 `Fuuko` is a [sea star](https://en.wikipedia.org/wiki/Starfish) generator.  Feed
@@ -151,6 +151,7 @@ The process of writing this program can be seen by opening
 Code layout is inspired by [Ibuki
 Fuuko](https://clannad.fandom.com/wiki/Fuko_Ibuki), for her love of sea stars.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.