Lots of refactoring

features/networking/networkd-br0.nix

@@ -0,0 +1,23 @@
+{ ... }: {
+  networking.useNetworkd = true;
+  systemd.network = {
+    enable = true;
+    netdevs."20-br0".netdevConfig = {
+      Kind = "bridge";
+      Name = "br0";
+    };
+    networks = {
+      "40-br0" = {
+        matchConfig.Name = "br0";
+        bridgeConfig = {};
+        linkConfig = {
+          RequiredForOnline = "routable";
+        };
+        networkConfig = {
+          DHCP = "ipv4";
+          IPv6AcceptRA = true;
+        };
+      };
+    };
+  };
+}