Fix home-manager impurity and add brew configuration

modules/overlays/rfd/default.nix

@@ -0,0 +1,40 @@
+{ lib, fetchFromGitHub, python3 }:
+
+let py = python3.override { };
+
+in
+with py.pkgs;
+buildPythonApplication rec {
+  pname = "rfd";
+  version = "v0.7.1";
+  format = "pyproject";
+
+  src = fetchFromGitHub {
+    owner = "davegallant";
+    repo = "rfd";
+    rev = version;
+    hash = "sha256-imFSkCFeSMLW7QYYF3cXp7tKEruLt8a6W3JDPblKHHU=";
+  };
+
+  # No tests included
+  doCheck = false;
+
+  nativeBuildInputs = [ poetry ];
+
+  propagatedBuildInputs = with py.pkgs; [
+    beautifulsoup4
+    click
+    colorama
+    requests
+    soupsieve
+  ];
+
+  passthru.python3 = python3;
+
+  meta = with lib; {
+    homepage = "https://www.redflagdeals.com/";
+    description = "View RedFlagDeals from the command line";
+    license = licenses.gpl3;
+    maintainers = [ davegallant ];
+  };
+}