Merged networking folder into core and services

system/services/avahi.nix

@@ -0,0 +1,12 @@
+{
+  # network discovery, mDNS
+  services.avahi = {
+    enable = true;
+    nssmdns4 = true;
+    publish = {
+      enable = true;
+      domain = true;
+      userServices = true;
+    };
+  };
+}

system/services/default.nix

@@ -1,5 +1,7 @@
 {
   imports = [
+    ./tailscale.nix
+    ./avahi.nix
     ./kanata.nix
     ./power.nix
     ./ssh.nix

system/services/tailscale.nix

@@ -0,0 +1,13 @@
+{
+  networking.firewall = {
+    trustedInterfaces = ["tailscale0"];
+    # required to connect to Tailscale exit nodes
+    checkReversePath = "loose";
+  };
+
+  # inter-machine VPN
+  services.tailscale = {
+    enable = true;
+    openFirewall = true;
+  };
+}