move all url fetches into main flake

packages/catppuccin-discord/default.nix

@@ -0,0 +1,57 @@
+{
+  lib,
+  stdenv,
+  fetchYarnDeps,
+  yarn,
+  nodejs,
+  fixup-yarn-lock,
+  nodePackages,
+  catppuccin-discord-git,
+}:
+stdenv.mkDerivation rec {
+  pname = "catppuccin-discord";
+  version = "unstable-${catppuccin-discord-git.date}-${catppuccin-discord-git.version}";
+
+  src = catppuccin-discord-git.src;
+
+  yarnOfflineCache = fetchYarnDeps {
+    yarnLock = "${src}/yarn.lock";
+    hash = "sha256-BhE3aKyA/LBErjWx+lbEVb/CIXhqHkXbV+9U2djIBhs=";
+  };
+
+  nativeBuildInputs = [
+    yarn
+    nodejs
+    fixup-yarn-lock
+    nodePackages.sass
+  ];
+
+  postPatch = ''
+    substituteInPlace package.json \
+      --replace-fail "--no-charset --no-source-map" ""
+  '';
+
+  configurePhase = ''
+    export HOME=$TMPDIR
+    yarn config --offline set yarn-offline-mirror ${yarnOfflineCache}
+    fixup-yarn-lock yarn.lock
+    yarn install --offline --frozen-lockfile --ignore-scripts --ignore-platform
+  '';
+
+  buildPhase = ''
+    yarn --offline build
+    yarn --offline release
+  '';
+
+  installPhase = ''
+    mkdir -p $out/share/catppuccin-discord
+    cp -r dist/dist/* $out/share/catppuccin-discord/
+  '';
+
+  meta = {
+    description = "Soothing pastel theme for Discord";
+    homepage = "https://github.com/catppuccin/discord";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.all;
+  };
+}

packages/overlay.nix

@@ -1,5 +1,8 @@
 final: prev: {
   spotify-webapp = final.callPackage ./spotify-webapp {};
+  catppuccin-discord = final.callPackage ./catppuccin-discord {
+    inherit (final) catppuccin-discord-git;
+  };
   openmw = final.callPackage ./openmw {
     openmw = prev.openmw;
     inherit (final) openmw-git;