switch from proton-ge overlay to nixpkgs proton-ge-bin

overlays/proton-ge.nix

@@ -1,20 +0,0 @@
-# Adapted from:
-# https://github.com/Shawn8901/nix-configuration/blob/182a45a6b193143ff7ff8e78bb66f7b869ea48d4/packages/proton-ge-custom/default.nix
-# Based on: https://github.com/NixOS/nixpkgs/issues/73323
-
-inputs: _final: prev: {
-  proton-ge-custom = prev.stdenv.mkDerivation (finalAttrs: rec {
-    name = "proton-ge-custom";
-    version = prev.lib.removeSuffix "\n" (
-      builtins.head (builtins.match ".*GE-Proton(.*)" (builtins.readFile "${inputs.proton-ge}/version"))
-    );
-    src = inputs.proton-ge;
-    # Took from https://github.com/AtaraxiaSjel/nur/blob/cf83b14b102985a587a498ba2c56f9f2bd9b9eb6/pkgs/proton-ge/default.nix
-    installPhase = ''
-      runHook preBuild
-      mkdir -p $out/bin
-      cp -r ${src}/* -t $out/bin/
-      runHook postBuild
-    '';
-  });
-}