pre-router: remove local nameserver

hosts/pre-router/configuration.nix

@@ -5,7 +5,6 @@
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
       ./router.nix
-      ./dns.nix
       ./ipv6.nix
       ./nginx.nix
    ];

hosts/pre-router/coredns-unbound.patch

@@ -1,13 +0,0 @@
-Index: plugin.cfg
-IDEA additional info:
-Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
-<+>UTF-8
-===================================================================
-diff --git a/plugin.cfg b/plugin.cfg
---- a/plugin.cfg	(revision ddee42c974d89d9beb4ebf7b82019624fbf0c456)
-+++ b/plugin.cfg	(revision 04ba8accb25837d30a16445a1365489fe9509333)
-@@ -69,3 +69,4 @@
- whoami:whoami
- on:github.com/coredns/caddy/onevent
- sign:sign
-+unbound:github.com/coredns/unbound

hosts/pre-router/dns.nix

@@ -1,20 +0,0 @@
-{ config, pkgs, lib, ...}:
-
-{
-  networking.firewall.interfaces.ens19.allowedUDPPorts = [ 53 ];
-  services.coredns = {
-    enable = true;
-    config = ''
-      .:53 {
-        errors
-        log
-        cache
-        prometheus 10.42.10.8:9253
-        forward . tls://2620:fe::fe tls://9.9.9.9 tls://2620:fe::9 tls://149.112.112.112 {
-          tls_servername dns.quad9.net
-          health_check 5s
-        }
-      }
-    '';
-  };
-}