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/kernel.nix

@@ -0,0 +1,32 @@
+{ config, pkgs, ... }: {
+  powerManagement.cpuFreqGovernor = "ondemand";
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+      grub = {
+        enable = true;
+        efiSupport = true;
+        device = "nodev";
+      };
+    };
+    blacklistedKernelModules = ["uvcvideo"];
+    initrd = {
+      includeDefaultModules = false;
+      kernelModules = [ "i915" ];
+    };
+    kernel.sysctl = {
+      "kernel.core_pattern" = "|/bin/false";
+      "kernel.sysrq" = 1;
+    };
+    kernelParams = [
+      "amdgpu.gpu_recovery=1"
+      "amdgpu.si_support=1"
+      "radeon.si_support=0"
+      "intel_pstate=passive"
+      "msr.allow_writes=on"
+    ];
+    kernelPackages = pkgs.lib.mkForce (pkgs.linuxPackagesFor pkgs.linux-lava);
+  };
+  zramSwap.enable = true;
+}