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.

2018/poikola/README.md

@@ -4,18 +4,13 @@ Timo Poikola <ioccc2018@ig.fi>
 <https://ig.fi/>  
 <https://ig.fi/other/ioccc>  
 
+
 ## To build:
 
 ```sh
 make
 ```
 
-NOTE: some have reported that Terminal.app in macOS does not work and one might
-need a different terminal emulator like that from
-[XQuartz](https://www.xquartz.org) but [Cody Boone
-Ferguson](/winners.html#Cody_Boone_Ferguson) reported that this works fine in
-macOS Ventura with Terminal.app. YMMV of course.
-
 
 ## To run:
 
@@ -23,6 +18,7 @@ macOS Ventura with Terminal.app. YMMV of course.
 ./prog
 ```
 
+
 ## Try:
 
 On terminal supports 24 bit color, has black background, and size at least 125x38, try:
@@ -31,6 +27,7 @@ On terminal supports 24 bit color, has black background, and size at least 125x3
 ./prog
 ```
 
+
 ## Judges' remarks:
 
 It is said by some students of Astronomy:
@@ -42,6 +39,7 @@ Many [Mnemonic variations](http://www.star.ucl.ac.uk/%7Epac/obafgkmrns.html) exi
 You might wish, on a star, to better understand the colors being displayed.
 And those in the deep south might wish to go north for a better view.
 
+
 ## Author's remarks:
 
 ### How to build:
@@ -156,6 +154,7 @@ the Caesar cipher with the key 18.
     Lzw xajkl tsffwj ak wfugvwv mkafy AWWW 754 xdgslk gf dafw 47. Al ak hjaflwv
     gfdq gf dalldw-wfvasf esuzafwk.
 
+
 ## Copyright and CC BY-SA 4.0 License:
 
 This file is Copyright (c) 2023 by Landon Curt Noll.  All Rights Reserved.