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.

2006/borsanyi/README.md

@@ -4,15 +4,13 @@ Szabolcs Borsanyi
 United Kingdom  
 s.borsanyi at sussex dot ac dot uk  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed (the Makefile)
-under some systems where the `lpthread` was not implicitly linked in. Thank you
-Cody!
 
 ## To run:
 
@@ -20,12 +18,14 @@ Cody!
 ./borsanyi string > file.gif
 ```
 
+
 ## Try:
 
 ```sh
 ./borsanyi ioccc@example.com > example.gif
 ```
 
+
 ## Judges' remarks:
 
 This entry uses a very user-friendly representation of the font
@@ -37,6 +37,7 @@ recognition tools.  The amount of imagination necessary to
 recognise the @ character will certainly challenge a few
 anti-CAPTCHA tools.
 
+
 ## Author's remarks:
 
 ### Email address to gif converter
@@ -98,6 +99,7 @@ output is used for a binary output, which might cause problems.
 To avoid most caveats, the program does not output the octet
 `0x0a`.  The program assumes the use of ASCII.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.