Use polybar override and added tailscale

system/modules/tailscale.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, self, ... }:
+
+let
+  cfg = config.samfelag.modules.tailscale;
+in
+{
+  options.samfelag.modules.tailscale = {
+    enable = lib.mkEnableOption "tailscale";
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.tailscale = {
+      enable = true;
+    };
+  };
+}