nix: renamed nix configurations

nix/home/_/default.nix

@@ -15,6 +15,8 @@ in
   };
 
   imports = [
+    ./user-nixconf.nix
+
     ./fish
     ./direnv
     ./atuin

nix/home/_/user-nixconf.nix

@@ -0,0 +1,33 @@
+# generates user's substituter's config
+# should be used with home-manager
+{ pkgs, lib, ... }:
+{
+  nix.package = lib.mkDefault pkgs.nixVersions.nix_2_21;
+  nix.settings = {
+    /*
+      substituters can only be used by users that are trusted by nix -> nix trusts the user to do it right
+      trusted-substituters can be used by any user -> nix trusts everything the substituter provides
+
+      "In addition, each store path should be trusted as described in trusted-public-keys"
+      -> keys for everything
+    */
+
+    extra-substituters = [
+      "https://nix-community.cachix.org"
+      "https://leana8959.cachix.org"
+    ];
+    extra-trusted-substituters = [
+      "https://nix-community.cachix.org"
+      "https://leana8959.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "leana8959.cachix.org-1:CxQSAp8lcgMv8Me459of0jdXRW2tcyeYRKTiiUq8z0M="
+    ];
+    experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+    allow-import-from-derivation = "true";
+  };
+}