📝 Update install.md

Author: Freed-Wu

docs/resources/install.md

@@ -14,32 +14,44 @@ uninstall:
 sudo pacman -R python-repl-python-wakatime
 ```
 
-## [Nix](https://nixos.org)
-
-For NixOS, add the following code to `/etc/nixos/configuration.nix`:
+## [NUR](https://nur.nix-community.org/repos/freed-wu)
 
 ```nix
 { config, pkgs, ... }:
 {
-  nix.settings.experimental-features = [ "flakes" ];
-  environment.systemPackages =
-    let
-      repl-python-wakatime = (
-        builtins.getFlake "github:wakatime/repl-python-wakatime"
-      ).packages.${builtins.currentSystem}.default;
-    in
-    [
-      repl-python-wakatime
-    ];
+  nixpkgs.config.packageOverrides = pkgs: {
+    nur = import
+      (
+        builtins.fetchTarball
+          "https://github.com/nix-community/NUR/archive/master.tar.gz"
+      )
+      {
+        inherit pkgs;
+      };
+  };
+  environment.systemPackages = with pkgs;
+      (
+        python3.withPackages (
+          p: with p; [
+            nur.repos.Freed-Wu.repl-python-wakatime
+          ]
+        )
+      )
 }
 ```
 
-For nix,
+## [Nix](https://nixos.org)
 
 ```sh
 nix shell github:wakatime/repl-python-wakatime
 ```
 
+Run without installation:
+
+```sh
+nix run github:wakatime/repl-python-wakatime -- --help
+```
+
 ## [PYPI](https://pypi.org/project/repl-python-wakatime)
 
 Install: