move pleroma to SP module

sp-modules/pleroma/cleanup-module.nix

@@ -0,0 +1,17 @@
+{ config, lib, ... }:
+let
+  inherit (import ./common.nix config) secrets-exs sp;
+in
+# FIXME do we really want to delete passwords on module deactivation!?
+{
+  config = lib.mkIf (!sp.modules.pleroma.enable) {
+    system.activationScripts.pleroma =
+      lib.trivial.warn
+        (
+          "pleroma service is disabled, ${secrets-exs} will be removed!"
+        )
+        ''
+          rm -f -v ${secrets-exs}
+        '';
+  };
+}