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.

1990/scjones/README.md

@@ -6,13 +6,13 @@ SDRC
 Milford, OH 45150    
 US  
 
+
 ## To build:
 
 ```sh
 make all
 ```
 
-
 Modern compilers failed to compile this entry:
 
 ```c
@@ -26,9 +26,6 @@ but we were able to get it to compile with modern compilers by specifying the
 `-ansi` flag with a tip from [Yusuke Endoh](/winners.html#Yusuke_Endoh). Thank
 you Yusuke! 
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) pointed out that the
-compiler option `-trigraphs` would also have worked.
-
 
 ## To run:
 
@@ -36,6 +33,7 @@ compiler option `-trigraphs` would also have worked.
 ./scjones
 ```
 
+
 ## Judges' remarks:
 
 The addition of trigraphs has made it easier to make programs hard to read.  It
@@ -69,6 +67,7 @@ standpoint) character sets.  In short, it should be very widely portable.  As an
 extra added attraction, all of the lines are under 72 characters long, which
 would allow for sequence numbers to be punched in columns 73-80 :-).
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.