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/jarijyrki/README.md

@@ -12,6 +12,7 @@ Forsellesintie 1-3A10
 Finland  
 <https://web.archive.org/web/20061205082106/http://personal.eunet.fi/pp/halo/>  
 
+
 ## To build:
 
 ```sh
@@ -20,10 +21,6 @@ make
 
 You will need X11 header files and libraries installed to build this program.
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made it easier to
-compile this by adding `X11/` to the includes of `Xlib.h` and `keysym.h`. Thank
-you Cody!
-
 
 ## To run:
 
@@ -33,6 +30,7 @@ you Cody!
 
 You will need a system capable of displaying the results of X Window programs.
 
+
 ## Try:
 
 ```sh
@@ -63,6 +61,8 @@ And observe that it matches what you had in the previous run!
 
 NOTE: changing the dimension parameters (see the authors' comments) renders
 existing spreadsheet files unusable.
+
+
 ## Judges' remarks:
 
 This entry is one of those that makes you wonder why some commercial software
@@ -70,6 +70,7 @@ needs tens to hundreds of <strike>megabytes</strike>gigabytes to install!  This
 entry does not simply do the basics, it includes graphing features.  All this
 program needs now is a flight simulator!
 
+
 ## Author's remarks:
 
 ### 1. OVERVIEW
@@ -462,6 +463,7 @@ to a new name by exchanging it on the command line and in the program with
 another character. Note that there are *no* free characters in the program
 currently.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.