Add try scripts to 2020/ferguson2, other updates

The try.sh script is for the original entry. The try.alt.sh is of course
for the alt version that I only recently made.

Removed html files recode.html and chocolate-cake.html (the horror! But
there is the markdown file so all is good... or would be if it wasn't
for the fact it's enciphered as a fun way to experience the entry .. or
else otherwise a frustration if there wasn't
2020/ferguson1/chocolate-cake.md? :-) ).

Updated .gitignore.

Minor updates to chocolate cake file: but of course for most people they
might want 2020/ferguson1/chocolate-cake.md instead.

This should be all that needs to be done for 2020/ferguson2 - for now
anyway. The documentation has not been checked for typos/formatting but
that might happen another time.

thanks-for-help.md

@@ -4368,6 +4368,11 @@ and I encourage you to do so as the cake is quite picky!
 [Cody](#cody), with intentional irony here :-), fixed formatting, links and typos in
 various files.
 
+He also added the [try.sh](/2020/ferguson2/try.sh) script.
+
+He also added the [alt code](/2020/ferguson2/README.md#alternate-code) and the
+[try.alt.sh](/2020/ferguson2/try.alt.sh) script.
+
 He also fixed some issues that occurred when files were renamed to `.md` from
 `.markdown`.