restructure

- users/rin/default.nix -> users/rin.nix
- users/rin/home.nix +-> users/rin.nix
- users/rin/*.nix -> modules/user/*.nix
- users/rin/scripts/ -> scripts/
- hosts/winter/default.nix -> hosts/winter.nix
- hosts/winter/*.nix -> modules/system/*.nix

- modules are dynamically imported as sets for system and user

scripts/osu

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+cd ~/Games/osu
+
+export DRI_PRIME=1
+export vblank_mode=0
+export STAGING_AUDIO_DURATION=400000
+
+wine ~/.local/bin/ipc-bridge.exe &
+wine osu\!.exe