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

modules/user/sxhkd.nix

@@ -0,0 +1,57 @@
+{ config, pkgs, ... }:
+let
+  super = "Mod4";
+  alt = "Mod1";
+in {
+  services.sxhkd = {
+    enable = true;
+    keybindings = {
+      # Rofi (App launcher)
+      "super + Return" = "rofi -lines 12 -padding 18 -width 60 -location 0 -show drun -sidebar-mode -columns 3 -font 'Noto Sans 8'";
+
+      # Printscreen
+      "Print" = "maim -us | tee ~/Pictures/Screenshots/$(date +%s)c.png | xclip -selection clipboard -t image/png";
+      "shift + Print" = "maim -u | tee ~/Pictures/Screenshots/$(date +%s).png | xclip -selection clipboard -t image/png";
+
+      # Quick-kill picom
+      "super + p" = "systemctl --user stop picom";
+      "super + shift + p" = "systemctl --user restart picom";
+
+      # Volume
+      "XF86Audio{RaiseVolume,LowerVolume,Mute}" = "pamixer -{i 5,d 5,t}";
+
+      # Brightness
+      "XF86MonBrightness{Up,Down}" = "light -{A,U} 10";
+      "shift + XF86MonBrightness{Up,Down}" = "light -{A,U} 1";
+
+      # Gamma
+      "ctrl + XF86MonBrightness{Up,Down}" = "xgamma -gamma {1.3,1}";
+
+      # Kill focused window
+      "super + {_,shift + }c" = "bspc node -{c,k}";
+
+      # Change focus
+      "super + {h,j,k,l}" = "bspc node -f {west,south,north,east}";
+      "super + {Left,Down,Up,Right}" = "bspc node -f {west,south,north,east}";
+
+      # Switch windows
+      "super + shift + {h,j,k,l}" = "bspc node -s {west,south,north,east}";
+      "super + shift + {Left,Down,Up,Right}" = "bspc node -s {west,south,north,east}";
+
+      # Move focused window
+      "super + shift + {1-9,0}" = "bspc node -d ^{1-9,10}";
+
+      # Toggle tiled/fullscreen/floating
+      "super + {t,f,space}" = "bspc node -t '~{tiled,fullscreen,floating}'";
+
+      # Exit / Restart bspwm
+      "super + shift + {q,r}" = "bspc {quit,wm -r}";
+
+      # Restart sxhkd
+      "super + shift + s" = "pkill -USR1 -x sxhkd";
+
+      # Workspace switching
+      "super + {1-9,0}" = "bspc desktop -f ^{1-9,10}";
+    };
+  };
+}