feat(systemModules:host): add initial host configuration module

used to define general host configuration, including:

- hardware
- name
- admin
- type
- role

system/modules/host/name/default.nix

@@ -0,0 +1,21 @@
+{ lib, config, ... }:
+
+let
+  inherit (lib) types mkOption;
+  cfg = config.systemModules.host;
+in
+
+{
+  options.systemModules.host = {
+    name = mkOption {
+      type = types.str;
+      default = "ooksgeneric";
+      description = "Name of host machine";
+    };
+  };
+
+  config = {
+    networking.hostname = cfg.name;
+    environment.sessionVariables.HN = cfg.name;
+  };
+}