refactor: aquamarine - enable tailscale

modules/nixos/base/networking/avahi.nix

@@ -0,0 +1,15 @@
+{
+  # Network discovery on a local network, mDNS
+  # With this enabled, you can access your machine at <hostname>.local
+  # it's more convenient than using the IP address.
+  # https://avahi.org/
+  services.avahi = {
+    enable = true;
+    nssmdns4 = true;
+    publish = {
+      enable = true;
+      domain = true;
+      userServices = true;
+    };
+  };
+}