Nix refactor (#93)

* default.nix -> nix/default.nix (to consolidate nix files)

* add esbuild to devShell

* nixpkgs-fmt -> nixfmt-rfc-style

nixpkgs-fmt is being deprecated

* format flake.nix and nix/default.nix w nixfmt-rfc-style

* have overlay and default callPackage on ./nix/default.nix

* Update flake.nix

Co-authored-by: orangc <orangc@proton.me>

* remove exports from shellHooks

* refactor overlay

* update BinPath in nix/default.nix

---------

Co-authored-by: orangc <orangc@proton.me>

nix/default.nix

@@ -0,0 +1,60 @@
+{ inputs
+, pkgs
+, system
+, stdenv
+, lib
+, writeShellScriptBin
+, bun
+, dart-sass
+, fd
+, accountsservice
+, btop
+, pipewire
+, bluez
+, bluez-tools
+, grimblast
+, gpu-screen-recorder
+, networkmanager
+, brightnessctl
+, matugen
+, swww
+, python3
+, gnome
+}:
+let
+  ags = inputs.ags.packages.${system}.default.override {
+    extraPackages = [ accountsservice ];
+  };
+
+  pname = "hyprpanel";
+  config = stdenv.mkDerivation {
+    inherit pname;
+    version = "latest";
+    src = ./.;
+
+    buildPhase = ''
+      ${bun}/bin/bun build ./main.ts \
+        --outfile main.js \
+        --external "resource://*" \
+        --external "gi://*"
+    '';
+
+    installPhase = ''
+      mkdir $out
+      cp -r assets $out
+      cp -r scss $out
+      cp -r widget $out
+      cp -r services $out
+      cp -f main.js $out/config.js
+    '';
+  };
+in
+{
+  desktop = {
+    inherit config;
+    script = writeShellScriptBin pname ''
+      export PATH=$PATH:${lib.makeBinPath [dart-sass fd btop pipewire bluez bluez-tools grimblast gpu-screen-recorder brightnessctl gnome.gnome-bluetooth python3]}
+            ${ags}/bin/ags -b hyprpanel -c ${config}/config.js $@
+    '';
+  };
+}