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.

1993/lmfjyh/README.md

@@ -3,6 +3,7 @@
 Jyrki Holopainen  
 Finland  
 
+
 ## To build:
 
 This entry will not compile with gcc < 2.3.3 as it relied on a bug which was
@@ -37,10 +38,10 @@ If you have gcc < 2.3.3 (i.e. the entry can compile):
 ./lmfjyh
 ```
 
+
 ### Alternate code
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) added an alternate
-version which does what the program did with gcc < 2.3.3. To use:
+To use:
 
 ```sh
 make alt
@@ -49,8 +50,6 @@ make alt
 Use `lmfjyh.alt` as you would `lmfjyh` above. Note that other code could also be
 done with this bug; see the author's remarks for more details.
 
-Thank you Cody!
-
 
 ## Judges' remarks:
     
@@ -196,6 +195,7 @@ tools supporting it. The advantages over the traditional methods
 are, however, so great that there is no doubt that this method will
 be new standard.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.