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/system/packages.nix

@@ -0,0 +1,33 @@
+{ config, pkgs, ...}: {
+  environment.systemPackages = with pkgs; [
+    efibootmgr
+    git
+    gparted
+    htop
+    libarchive
+    lf
+    msr-tools
+    ncdu
+    neovim
+    rsync
+    wget
+
+    gnome3.nautilus
+  ];
+  environment.variables.EDITOR = "nvim";
+
+  hardware.opengl.extraPackages = with pkgs; [
+     vaapiIntel
+     vaapiVdpau
+     libvdpau-va-gl
+     intel-ocl
+     rocm-opencl-icd
+     rocm-opencl-runtime
+  ];
+  programs.light.enable = true;
+  hardware.opentabletdriver.enable = true;
+  programs.steam.enable = true;
+  services.dbus.packages = [ pkgs.gnome3.dconf pkgs.gcr ];
+  services.gnome.sushi.enable = true;
+  # services.ipfs.enable = true;
+}