adding json to searx for RAG in open-webui

modules/searx.nix

@@ -13,6 +13,7 @@ with lib;
         server.port = 8085;
         server.bind_address = "0.0.0.0";
         server.secret_key = "cc842bf5ef8c5c7ec04dd29e1f4815bc6ac6c0bcb806b5185d035331bcec58bf";
+        search.formats = [ "html" "json" ];
 
         # engines = lib.singleton
         #   { name = "wolframalpha";