add ntfy and searxng along with other tweaks

modules/system/homelab/search.nix

@@ -0,0 +1,19 @@
+{ ... }: {
+  services.searx = {
+    enable = true;
+    redisCreateLocally = true;
+    settings = {
+      server = {
+        bind_address = "127.0.0.1";
+        port = 8091;
+      };
+      general = {
+        debug = false;
+        donation_url = false;
+        contact_url = false;
+        privacy_policy_url = false;
+        enable_metrics = true;
+      };
+    };
+  };
+}