feat: rework to modular

modules/secrets/env.nix

@@ -0,0 +1,7 @@
+{ lib, ... }:
+let
+  defaults = import ../../lib/defaults.nix { inherit lib; };
+in
+{
+  home.sessionVariables = defaults.companySessionVariables;
+}

modules/secrets/openbao.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  imports = [ ./env.nix ];
+
+  home.packages = [ pkgs.openbao ];
+}