Move nh and just into direnv dev-shell

hosts/common.nix

@@ -52,10 +52,7 @@
     vimAlias = true;
   };
 
-  environment.systemPackages = [
-    pkgs.git
-    pkgs.just
-  ];
+  environment.systemPackages = [ pkgs.git ];
 
   nixpkgs.config.allowUnfreePredicate =
     pkg:

hosts/inspiron/default.nix

@@ -31,6 +31,4 @@
       ssh.enable = true;
     };
   };
-
-  programs.nh.enable = true;
 }

hosts/north/default.nix

@@ -29,6 +29,5 @@
     };
   };
 
-  programs.nh.enable = true;
   programs.steam.enable = true;
 }