update year level .filelist

Added new YYYY/index.html files.

Removed var.mk as such special top level files are
added (or not) in various bin tools.

1993/.filelist

@@ -4,7 +4,7 @@
 1993/.filelist
 1993/.gitignore
 1993/guidelines.txt
+1993/index.html
 1993/mkentry.c
 1993/rules.txt
 1993/.year
-var.mk