Finish modularising config

There are still some things I want to change, but at least there aren't two systems now.

modules/gnupg.nix

@@ -0,0 +1,44 @@
+{ config, lib, ... }:
+
+{
+  options.chvp.gnupg = {
+    enable = lib.mkOption {
+      default = false;
+      example = true;
+    };
+    pinentryFlavor = lib.mkOption {
+      type = lib.types.str;
+      default = "curses";
+      example = "qt";
+      description = ''
+        Pinentry flavor for gnupg.
+      '';
+    };
+  };
+
+  config = lib.mkIf config.chvp.gnupg.enable {
+    chvp.zfs.homeLinks = [
+      { path = ".gnupg/crls.d"; type = "data"; }
+      { path = ".gnupg/private-keys-v1.d"; type = "data"; }
+      { path = ".gnupg/pubring.kbx"; type = "data"; }
+      { path = ".gnupg/trustdb.gpg"; type = "data"; }
+    ];
+    programs.gnupg.agent = {
+      enable = true;
+      pinentryFlavor = config.chvp.gnupg.pinentryFlavor;
+    };
+    home-manager.users.charlotte = { lib, ... }: {
+      home.activation.fixPermissionsCommands = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+        mkdir -p /home/charlotte/.gnupg
+        chmod u=rwX,go= /home/charlotte/.gnupg
+      '';
+      programs.gpg.enable = true;
+      services.gpg-agent = {
+        enable = true;
+        defaultCacheTtl = 7200;
+        maxCacheTtl = 99999;
+        pinentryFlavor = config.chvp.gnupg.pinentryFlavor;
+      };
+    };
+  };
+}