feat: add distributed-builds & many hosts

feat: remove nur & devenv
feat: adjust the structure to make it suitable for servers
feat: add iso/proxmox generators and add docs about it
feat: update ryan's openssh keys & add hashedPassword
feat: add proxmox's nodes into ssh_config, with alias

modules/nixos/user-group.nix

@@ -0,0 +1,21 @@
+{ ... }:
+
+{
+  users.groups = {
+    ryan = { };
+    docker = { };
+    wireshark = { };
+  };
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  users.users.ryan = {
+    # the hashed password with salt is generated by run `mkpasswd`.
+    hashedPassword = "$y$j9T$YQu5vhlnogjDFDWp9QkPh0$Eu85OiwllqvLg5fzRVMLVHNO7InA3ro8grTJJIepyH1";
+    home = "/home/ryan";
+    isNormalUser = true;
+    description = "ryan";
+    extraGroups = [ "ryan" "users" "networkmanager" "wheel" "docker" "wireshark" "adbusers" ];
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDiipi59EnVbi6bK1bGrcbfEM263wgdNfbrt6VBC1rHx ryan@ai-idols"
+    ];
+  };
+}