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

home/linux/server.nix

@@ -0,0 +1,30 @@
+{ ... }:
+
+{
+  imports = [
+    ../base/server
+
+    ./base/shell.nix
+    ./base/system-tools.nix
+  ];
+
+  # Home Manager needs a bit of information about you and the
+  # paths it should manage.
+  home = {
+    username = "ryan";
+    homeDirectory = "/home/ryan";
+
+    # This value determines the Home Manager release that your
+    # configuration is compatible with. This helps avoid breakage
+    # when a new Home Manager release introduces backwards
+    # incompatible changes.
+    #
+    # You can update Home Manager without changing this value. See
+    # the Home Manager release notes for a list of state version
+    # changes in each release.
+    stateVersion = "22.11";
+  };
+
+  # Let Home Manager install and manage itself.
+  programs.home-manager.enable = true;
+}