Fix markdown, html files and Makefile

In particular the lists were mangled; I made sure that the html files
have the IOCCC headers/footers by using rdiscount to another file and
then yanking/pasting the generated lists in the one file into the target
files.

I also removed terminals.markdown which was a mistake I made when I sent
a patch (so I assume) to the judges.

Makefile now refers to *.text instead of *.markdown and no longer refers
to judges file as that was only part of the preview repo for winners.

There might have been other changes I have made but everything *appears*
to be okay now.

2020/ferguson1/Makefile

@@ -421,10 +421,10 @@ MAY_NEED_GCC= gcc
 ##############################
 #
 OBJ= prog.o termcaps.o
-DATA= COMPILING HACKING bugs.markdown cannibalism.log \
-    chocolate-cake.markdown crazy.log gameplay.markdown \
-    judges.markdown snake-colours.sh snake.1 spoilers.markdown \
-    termcaps.c terminals.markdown troubleshooting.markdown
+DATA= COMPILING HACKING bugs.text cannibalism.log \
+    chocolate-cake.text crazy.log gameplay.text \
+    snake-colours.sh snake.1 spoilers.text \
+    termcaps.c terminals.text troubleshooting.text
 TARGET= prog snake snake-colours play snake-colours termcaps ${ALT_TARGET}
 #
 ALT_OBJ=