feat: rewrite to more nixy flakes

pkgs/fish/default.nix

@@ -1,10 +1,6 @@
-{
-    pkgs ? import <nixpkgs> { },
-    lib ? pkgs.lib,
-    ...
-}:
+{ stdenv, ... }:
 
-pkgs.stdenv.mkDerivation rec {
+stdenv.mkDerivation rec {
     pname = "fish-config";
     version = "1.0";
 
@@ -14,9 +10,9 @@ pkgs.stdenv.mkDerivation rec {
     };
 
     installPhase = ''
-              mkdir -p $out
-        	  cp -r ${src}/* $out/
-        	'';
+        mkdir -p $out
+        cp -r ${src}/* $out/
+    '';
 
     dontUnpack = true;
     dontBuild = true;