refactor: add NixOS configuration files for server and workstation setups

config/nixos/packages/common/default.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+{
+  imports = [ ./virtualisation.nix ];
+
+  environment.systemPackages = with pkgs; [
+    yubikey-manager
+    trash-cli
+    sqlite # Used for managing SQLite databases (Brave Settings etc.)
+    xcp # Rust implementation of cp/mv command
+    pandoc # Document converter (Markdown, HTML, PDF etc.) (Mostly used for static site generators)
+  ];
+}

config/nixos/packages/common/virtualisation.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  pkgs,
+  pkgs-unstable,
+  ...
+}:
+{
+  boot.kernelModules = [ "kvm-amd" ];
+
+  environment.systemPackages = with pkgs; [
+    qemu
+    OVMF
+  ];
+
+  virtualisation = {
+    docker = {
+      enable = true;
+      package = pkgs-unstable.docker;
+      autoPrune.enable = true;
+      daemon.settings = {
+        "live-restore" = false;
+      };
+    };
+
+    libvirtd = {
+      enable = true;
+
+      qemu = {
+        package = pkgs.qemu;
+        runAsRoot = true;
+        swtpm.enable = true;
+        ovmf = {
+          enable = true;
+          packages = [ pkgs.OVMF.fd ];
+        };
+      };
+    };
+  };
+}