Move Nix files back to the root of the project

pkgs/passmenu-otp.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+
+with pkgs;
+
+stdenv.mkDerivation {
+  pname = "passmenu-otp";
+  version = "0.1.0";
+
+  src = fetchFromGitHub {
+    owner = "petrmanek";
+    repo = "passmenu-otp";
+    rev = "master";
+    sha256 = "sha256-2EGomeK/p3uVfgho5xGR11ovJQ2q3cPZoFG+z88DyxA=";
+  };
+
+  buildInputs = [
+    pass
+  ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp passmenu-otp $out/bin/passmenu-otp
+    chmod +x $out/bin/passmenu-otp
+  '';
+
+  meta = {
+    homepage = "https://github.com/petrmanek/passmenu-otp";
+    mainProgram = "passmenu-otp";
+  };
+}