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.

2011/richards/README.md

@@ -3,22 +3,20 @@
 Gregor Richards  
 <Richards@codu.org>  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
+
 ## To run:
 
 ```sh
 ./richards
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed a minor problem
-that showed up in both linux and macOS. He notes however that as of this time
-this entry does not work with macOS. See [bugs.md](/bugs.md) for more details.
-Thank you Cody!
 
 ## Try:
 
@@ -38,6 +36,7 @@ not the rule abuse) in a different way.  The author claims that his calculator
 does just-in-time compilation.  What would you do to prove or disprove his claim
 without attempting to unravel the source?
 
+
 ## Author's remarks:
 
 This is an implementation of the classic UNIX
@@ -89,6 +88,7 @@ flags:
  * owcc 1.9 + x86 + Windows: Needs `-DNM -DAH -fno-stack-check`
  * gcc 4.4.5 + sh4: -O0 works, higher optimization levels don't work for unknown reasons.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.