style(nixos): separate SSH configuration sections

configs/nixos/modules/network/ssh.nix

@@ -15,6 +15,7 @@ let
     "zeus"
   ];
   serverNames = [ "pikachu" ];
+
   isWorkstation = lib.elem config.networking.hostName workstationNames; # NOLINT(let_order)
   isServer = lib.elem config.networking.hostName serverNames; # NOLINT(let_order)
 
@@ -26,12 +27,14 @@ let
       (../../hosts + "/${host}/ssh_host_ed25519_key.pub")
       (../../hosts + "/${host}/ssh_host_rsa_key.pub")
     ];
+
   # NOLINT(let_order)
   managedTargets = lib.genAttrs (workstationNames ++ serverNames) (name: {
     hostName = registry.address.${name}.self;
     clientKey = clientKeyFor name;
     hostKeys = hostKeysFor name;
   });
+
   extraTargets = {
     # TODO: Pin Gitea's host key after migrating it from Proxmox.
     gitea = {
@@ -44,6 +47,7 @@ let
       ];
     };
   };
+
   # NOLINT(let_order)
   mkTarget = name: target: {
     hostName = target.hostName or name;
@@ -60,6 +64,7 @@ let
   defaultAuthorizedKeys = lib.flatten (
     clientKeysFor workstationNames ++ lib.optional isServer (clientKeysFor serverNames)
   );
+
   outboundTargetNames = # NOLINT(let_order)
     let
       groupTargets =
@@ -93,6 +98,7 @@ let
       names = lib.unique (target.aliases ++ [ target.hostName ]);
     in
     map withPort names;
+
   keyWithoutComment = key: lib.concatStringsSep " " (lib.take 2 (lib.splitString " " key));
 
   sshSettingsFor =