add ssh for server, add vscodium for pc, refactor hostnames

modules/networking/ssh.nix

@@ -0,0 +1,27 @@
+{ config, options, lib, pkgs, ... }:
+let
+  inherit (lib.modules) mkIf;
+in
+{
+  options.modules.networking.ssh = let
+    inherit (lib.options) mkEnableOption;
+  in {
+    enable = mkEnableOption "enable ssh";
+  };
+
+  config = mkIf config.modules.networking.ssh.enable {
+    services.openssh = {
+      enable = true;
+      openFirewall = true;
+      ports = [ 22 ];
+      settings = {
+        PassswordAuthentication = true;
+        AllowUsers = [ "chris", "root" ];
+        UseDns = true;
+        UsePAM = true;
+        PermitRootLogin = "prohibit-password";
+        PermitEmptyPasswords = "no";
+      };
+    };
+  };
+}