fluent-icons: Generate icons with nix

Unfortunately lutgen doesn't have transparency support added to its main
branch yet and there doesn't seem to be any indicator that this will
ever be added, so we'll have to use an alternative to avoid manually
compiling it.

packages/fluent-icons.nix

@@ -1,24 +1,30 @@
 {
   lib,
   stdenvNoCC,
-  fetchzip,
+  fluent-icon-theme,
+  fd,
+  inkscape,
 }:
 
 stdenvNoCC.mkDerivation {
   pname = "fluent-icons";
   version = "2024-01-02";
 
-  src = fetchzip {
+  dontUnpack = true;
-    url = "https://files.catbox.moe/1we56t.zip";
+
-    hash = "sha256-gs33iDv+u6O03a+/QvDtKt/aHduZww4F3Fm3F40d1GI=";
+  nativeBuildInputs = [
-    stripRoot = false;
+    fd
-  };
+    inkscape
+    fluent-icon-theme
+  ];
 
   installPhase = ''
     runHook preInstall
 
-    mkdir -p $out
+    cp ${fluent-icon-theme}/share/icons/Fluent/scalable/places/default-* .
-    cp -r * $out
+    fd -e svg -x inkscape -w 512 -h 512 "{}" -o "{.}.png"
+
+    install -Dm644 *.png -t $out
 
     runHook postInstall
   '';