discord: use zelk with tokyonight colourscheme

packages/discord-tokyonight/default.nix

@@ -0,0 +1,14 @@
+{
+  inputs,
+  stdenvNoCC
+}:
+stdenvNoCC.mkDerivation {
+  pname = "discord-tokyonight";
+  version = "1.0.0";
+  dontUnpack = true;
+  installPhase = ''
+    cp -r ${inputs.discord-tokyonight} $out
+    chmod u+w $out
+    cp ${./powercord_manifest.json} $out/powercord_manifest.json
+  '';
+}

packages/discord-tokyonight/powercord_manifest.json

@@ -0,0 +1,8 @@
+{
+    "version": "1.0",
+    "name": "Tokyo Night Colours",
+    "author": "DanisDGK",
+    "license": "MIT",
+    "theme": "colors/tokyonight_night.css",
+    "description": "Tokyonight colourscheme"
+}