feat: add notion desktop entry

utils/make-icon.nix

@@ -0,0 +1,29 @@
+{
+  pkgs ? import <nixpkgs> { },
+  ...
+}:
+let
+  makeIconPkg =
+    {
+      name,
+      url,
+      sha256,
+    }:
+    pkgs.stdenvNoCC.mkDerivation rec {
+      inherit name;
+      pname = name;
+
+      src = pkgs.fetchurl {
+        inherit url sha256;
+      };
+
+      dontUnpack = true;
+
+      buildInputs = [ ];
+      installPhase = ''
+        mkdir -p $out/share/icons
+        cp -r $src $out/share/icons
+      '';
+    };
+in
+makeIconPkg