Fix links/text in 2020/ferguson[12]

Some of the removed text referred to things that no longer exist due to
shortening the text (a bit).

Others were that the text used to say that one should try the markdown
or html file depending on if read in GitHub or not but now it's only the
html files so that reference to GitHub was removed.

Other problems were discovered and fixed as well.

2020/ferguson1/index.html

@@ -437,7 +437,7 @@ MAXSIZE</strong> you win <em>before</em> you grow to the full size!</p></li>
 size to grow every time you eat a bug. Default 5; negative
 values are allowed. ‘Negativity’ creates for fun gameplay modes with
 enough creativity. See <a href="gameplay.html">gameplay.html</a>
-GitHub) as well as <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/play.sh">play.sh</a> for some examples.</p></li>
+as well as <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/play.sh">play.sh</a> for some examples.</p></li>
 <li><p><strong>SHED</strong><br>
 every <strong>SHED</strong> movements you will grow (&gt; 0), shrink (&lt; 0) or
 stay the same length (0) by the <strong>SHEDS</strong> (below) value. Again
@@ -864,10 +864,6 @@ the years and who I owe a great deal to. Thank you for believing in me and my
 programming abilities (and other abilities) even when I couldn’t believe in
 myself! Very much appreciated especially coming from an amazing programmer who I
 have huge admiration for!</p>
-<p>I want to thank Ilya Kurdyukov for his helpful comments, suggestions and
-reporting the (undocumented) ‘problem’ about half-width/full-width char spacing.
-He’s been playing with some versions of his own and will have them on GitHub
-after the 2020 IOCCC winning entries have been published.</p>
 <p>Finally I want to thank Leo Broukhis, Simon Cooper and Landon Curt Noll for
 continuing to hold the contest after all these years - and for having selected
 my entries. It’s a huge honour; thank you! I also happen to <strong>love</strong> your