refactor(grfn): Stop importing nixpkgs a bunch of times

Once is enough!

<grfn> https://tazj.in/blobs/touch-garbage.jpg

Change-Id: I68f66669e82d35a71752638450fa4b820e137172
Signed-Off-By: Florian Klink <flokli@flokli.de>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3048
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

users/grfn/system/home/modules/common.nix

@@ -13,8 +13,6 @@
     ../modules/lib/cloneRepo.nix
   ];
 
-  nixpkgs.config.allowUnfree = true;
-
   programs.password-store.enable = true;
 
   grfn.impure.clonedRepos.passwordStore = {

users/grfn/system/home/modules/emacs.nix

@@ -43,13 +43,6 @@ in {
         gnutls
       ];
 
-      nixpkgs.overlays = [
-        (import (builtins.fetchTarball {
-          url = "https://github.com/nix-community/emacs-overlay/archive/54afb061bdd12c61bbfcc13bad98b7a3aab7d8d3.tar.gz";
-          sha256 = "0hrbg65d5h0cb0nky7a46md7vlvhajq1hf0328l2f7ln9hznqz6j";
-        }))
-      ];
-
       programs.emacs = {
         enable = true;
         package = pkgs.emacsUnstable;

users/grfn/system/home/modules/email.nix

@@ -37,10 +37,6 @@ in {
     msmtp
   ];
 
-  # nixpkgs.overlays = [(self: super: {
-  #   notifymuch = self.python3Packages.callPackage ../../pkgs/notifymuch.nix {};
-  # })];
-
   systemd.user.services = mapAttrs' (name: account: {
     name = escapeUnitName "lieer-${name}";
     value.Service = {