Rename *.text *.md

As luck would have it the only entries where this applied were my own.
The links/references to these files have been changed in the files.

An unfortunate problem is that in 2020/ferguson1 there are several
*.markdown files. I will have to go through these and figure out which
ones should be changed to .md and which ones can be removed. This can
happen later but in the meantime the references are to .md. I believe
the only difference is that the .md has the footer added by the judges.
This was a workaround with the fact that I wasn't sure (and still am not
entirely sure) the generation of the html files will work. It might be
that the .markdown files have the footer and the .md files do not but
this can be dealt with later anyway.

2020/ferguson2/enigma.1

@@ -20,7 +20,7 @@ Source file to the simulator.
 .RS
 Source code to the configuration tool (not required but recommended).
 .RE
-\fIrecode.markdown\fP
+\fIrecode.md\fP
 .RS
 Markdown file with examples on how to use the recode program (along with the Enigma program).
 .RE
@@ -31,7 +31,7 @@ More information on the Enigma simulator IOCCC entry.
 \fIchocolate\-cake.markdown\fP
 \fIchocolate\-cake.html\fP
 .RS
-A file with a recipe of a delicious Double-layered Chocolate Fudge Cake that has been enciphered with one of 16 Enigma settings given in \fIrecode.markdown\fP which should give enough information on how to make use of the two programs in order to unlock this recipe.
+A file with a recipe of a delicious Double-layered Chocolate Fudge Cake that has been enciphered with one of 16 Enigma settings given in \fIrecode.md\fP which should give enough information on how to make use of the two programs in order to unlock this recipe.
 I recommend the html version for formatting.
 .RE
 \fIenigma.1\fP
@@ -47,7 +47,7 @@ The recode.c man page.
 \fB\-\fP Rudimentary parser allows for easily piping into the simulator settings (and file to encipher/decipher) but which also can be a bit confusing, unintuitive and does not handle too much input that well.
 .RE
 .RS
-\fB\-\fP There is one thing in particular I was unsure of when writing the simulator as far as how it is supposed to work: I believe I have it but there might be one issue. See \fIhint.markdown\fP for more information.
+\fB\-\fP There is one thing in particular I was unsure of when writing the simulator as far as how it is supposed to work: I believe I have it but there might be one issue. See \fIREADME.md\fP for more information.
 .RE
 .RS
 \fB\-\fP It was written by a human being.
@@ -56,10 +56,10 @@ The recode.c man page.
 \fB\-\fP Not a bug as some might want to believe, maybe: figuring out how the recode.c program works won't help you figure out how this works.
 .RE
 .RS
-\fB\-\fP For more please see \fIhint.markdown\fP.
+\fB\-\fP For more please see \fIREADME.md\fP.
 .SH EXAMPLES
 .PP
-Please see the \fIrecode.markdown\fP and \fIhint.markdown\fP files for examples and other information.
+Please see the \fIrecode.md\fP and \fIREADME.md\fP files for examples and other information.
 .SH AUTHOR
 Written by Cody Boone Ferguson for IOCCC 2020 (the 27th IOCCC).
 .SH SEE ALSO