added kafka and ollama data sets

systems/jeeves/services/kafka.nix

@@ -1,3 +1,12 @@
+let
+  vars = import ../vars.nix;
+in
 {
-  services.apache-kafka.enable = true;
+  services.apache-kafka = {
+    enable = true;
+    settings = {
+      listeners = [ "PLAINTEXT://localhost:9092" ];
+      "log.dirs" = [ vars.kafka ];
+    };
+  };
 }