Consolidate into variables

modules/home-manager/bitwarden.nix

@@ -1,10 +1,10 @@
-{ pkgs, ... }:
+{ pkgs, config, ... }:
 {
   programs.rbw = {
     enable = true;
     settings = {
       base_url = "https://vault.jelles.net";
-      email = "mail@jelles.net";
+      email = config.var.email;
       pinentry = pkgs.pinentry-gnome3;
     };
   };