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/schnitzi/README.md

@@ -13,10 +13,6 @@ US
 make all
 ```
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made this use `fgets()`
-not `gets()` to make it safer and to prevent an annoying warning with compiling
-and/or linking and/or runtime, the latter of which is interspersed with the
-output of the program itself. Thank you Cody for your assistance!
 
 ## To run:
 
@@ -33,6 +29,7 @@ where
 
 This entry will segfault if the file cannot be opened. This is not a bug.
 
+
 ## Try:
 
 ```sh
@@ -56,6 +53,7 @@ What is cat ?
 What is cat?
 ```
 
+
 ## Judges' remarks:
 
 After this program prints the contents of 'file', ask it
@@ -81,6 +79,7 @@ NOTE: If you have a ' in the question this entry might fail.
 
 NOTE: The author may also be contacted at: marks@aldrin.ksc.nasa.gov.
 
+
 ## Author's remarks:
 
 I wanted to write a program that would read in a text file in
@@ -126,6 +125,7 @@ question into individual words with a recursive call.
 The text for the info file, by the way, consists largely of headlines
 from the Weekly World News.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.