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.

2013/.filelist

@@ -5,8 +5,8 @@
 2013/.gitignore
 2013/guidelines.txt
 2013/hint.css
+2013/index.html
 2013/iocccsize.c
 2013/iocccsize.mk
 2013/rules.txt
 2013/.year
-var.mk