fix internal links in entry index.html from 1984 thru 2012

1992/marangon/README.md

@@ -25,7 +25,7 @@ NOTE: Some systems need to compile with `-ltermcap` as well as `-lcurses`.
 NOTE: The original winning source [marangon.orig.c](marangon.orig.c), found in
 the archive directory, assumed that `exit(3)` returns a value which cause
 problems for some systems where `exit(3)` returns a `void`.  The file
-[marangon.c](marangon.c) avoids this problem.
+[marangon.c](%%REPO_URL%%/1992/marangon/marangon.c) avoids this problem.
 
 
 ## Author's remarks: