move options back out to their config files, improve documentation

modules/hosts/sakamoto/sakamoto.nix

@@ -0,0 +1,30 @@
+{ inputs, self, ... }: {
+  flake.nixosConfigurations.sakamoto = inputs.nixpkgs.lib.nixosSystem {
+    modules = with self.nixosModules; [
+      global
+      sakamoto
+    ];
+  };
+
+  flake.nixosModules.sakamoto = { pkgs, config, lib, ... }: {
+    info = {
+      hostName = "sakamoto";
+      stateVersion = "26.11";
+    };
+
+    components.bootLoader = {
+      selection = "grub";
+      timeout = 0;
+    };
+
+    features = {
+      shells.defaultShell = "bash";
+
+      applications = {
+        cli = {
+          nh.enable = true;
+        };
+      };
+    };
+  };
+}