Revert "convert dired j/k bindings into Evil motions"

This reverts commit 14ac51372cfe033234d5865735d79da0a08ad521.

This broke my dired. Too bad.
my-buffers: ibuffer-quit has been removed (25.0.50.2)
ibuffer: use $HOME in building filter groups
custom update
buffers: add variable for ibuffer grouping