Remove foehammer backups abstraction, since it was possibly leaky.

nixos/common/backups.nix

@@ -1,11 +0,0 @@
-{lib, ...}: let
-  inherit (lib) mkOption types;
-in {
-  # Generic Backups.
-  options.foehammer.backups = {
-    paths = mkOption {
-      type = types.nullOr (types.listOf types.str);
-      default = [];
-    };
-  };
-}

nixos/common/services/vaultwarden.nix

@@ -47,9 +47,5 @@ in {
 
       environmentFile = cfg.envPath;
     };
-
-    foehammer.backups.paths = [
-      "/var/lib/vaultwarden"
-    ];
   };
 }