Move executables into local/bin

and fix known bustedness

local/bin/redshift-gtk-wrapper

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -o errexit
+
+main() {
+  export REDSHIFT_EXE=redshift-gtk
+  exec ~/.local/bin/redshift-wrapper "${@}"
+}
+
+main "${@}"