profiles/common-nix: Migrate nix common config zu profile

configuration/common/default.nix

@@ -7,7 +7,6 @@
     ./initrd.nix
     ./locale.nix
     ./networking.nix
-    ./nix.nix
     ./programs.nix
     ./ssh.nix
     ./systemd.nix

configuration/common/nix.nix

@@ -1,70 +0,0 @@
-{ lib, pkgs, ... }:
-
-{
-
-  clerie.nixfiles.enable = true;
-
-  clerie.system-auto-upgrade.enable = true;
-
-  nix.settings = {
-    trusted-users = [ "@wheel" "@guests" ];
-    auto-optimise-store = true;
-    # Keep buildtime dependencies
-    keep-outputs = true;
-    # Build local, when caches are broken
-    fallback = true;
-  };
-
-  nix.gc = lib.mkDefault {
-    automatic = true;
-    dates = "weekly";
-    options = "--delete-older-than 30d";
-  };
-
-
-  nix.settings = {
-    experimental-features = [
-      "flakes"
-      "nix-command"
-    ];
-    substituters = [
-      "https://nix-cache.clerie.de"
-    ];
-    trusted-public-keys = [
-      "nix-cache.clerie.de:bAt1GJTS9BOTcXFWj3nURrSlcjqikCev9yDvqArMP5g="
-    ];
-  };
-
-  # Pin current nixpkgs channel and flake registry to the nixpkgs version
-  # the host got build with
-  nix.nixPath = lib.mkForce [ "nixpkgs=${lib.cleanSource pkgs.path}" ];
-  nix.registry = {
-    "nixpkgs" = lib.mkForce {
-       from = {
-         type = "indirect";
-         id = "nixpkgs";
-       };
-       to = {
-         type = "path";
-         path = lib.cleanSource pkgs.path;
-       };
-       exact = true;
-    };
-    "templates" = {
-       from = {
-         type = "indirect";
-         id = "templates";
-       };
-       to = {
-         type = "git";
-         url = "https://git.clerie.de/clerie/flake-templates.git";
-       };
-    };
-  };
-
-  documentation.doc.enable = false;
-
-  environment.systemPackages = with pkgs; [
-    nix-remove-result-links
-  ];
-}