Remove unnecessary text from 2020/ferguson1

It's still a lot of text but now it's a bit less to .. uh, swallow. One
file was removed as it really served no purpose other than to make the
documentation longer in a way that is not helpful.

Updated manifest.

Regenerated html files.

2020/ferguson1/index.html

@@ -595,9 +595,9 @@ 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 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>
+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
@@ -666,7 +666,6 @@ email but I’m more likely to respond to mastodon messages.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.entry.json">.entry.json</a> - description of entry in JSON</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/gameplay.md">gameplay.md</a> - markdown source for gameplay.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
-<li><a href="halfwidth_vs_fullwidth.png">halfwidth_vs_fullwidth.png</a> - image for bugs.md</li>
 <li><a href="ioccc-cake.jpg">ioccc-cake.jpg</a> - image for chocolate cake</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.path">.path</a> - directory path from top directory</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/spoilers.md">spoilers.md</a> - markdown source for spoilers.html</li>