move xdg directories to the default location.

a lot of applications seem to hardcode this location, so it's better to
have something default, or default-adjasoned.

.local/bin/java-prime

@@ -0,0 +1,5 @@
+#!/usr/bin/sh
+export __NV_PRIME_RENDER_OFFLOAD=1
+export __VK_LAYER_NV_optimus=NVIDIA_only
+export __GLX_VENDOR_LIBRARY_NAME=nvidia
+exec java "$@" --no-window