Minor updates to 1984

Updated 1984/README.md with link to rules.txt.

Updated 1984/decot/README.md removing the note

    NOTE: This entry might not compile when using modern compilers.

as this was redundant (I already added more information in an earlier
commit). As well I moved the header Judges' comments below that note so
that the note about compiling is under the build section of the
README.md.

1984/README.md

@@ -7,7 +7,7 @@ on how to compile the winner and how to run the winning program.
 Look at the winning source and try to figure how it does what it does!
 You may then wish to look at the Author's comments for even more details.
 
-Restrictions against machine dependent code were not in the rules in 1984.
+Restrictions against machine dependent code were not in the [rules](rules.txt) in 1984.
 The source file size restriction was only 512 bytes.  Rules and results
 were posted to net.lang.c and net.unix-wizards.