improve sshd and add kitty's terminfo

profiles/base/terminals.nix

@@ -0,0 +1,4 @@
+{ pkgs, ... }: {
+  environment.systemPackages = with pkgs;
+    [ buildPackages.buildPackages.kitty.terminfo ];
+}

profiles/sshd/sshd.nix

@@ -1,5 +1,14 @@
 { ... }: {
-  services.openssh.enable = true;
+  services.openssh = {
-  services.openssh.permitRootLogin = "prohibit-password";
+    enable = true;
+    passwordAuthentication = false;
+    challengeResponseAuthentication = false;
+    permitRootLogin = "prohibit-password";
+    kexAlgorithms = [ "curve25519-sha256@libssh.org" ];
+    extraConfig = ''
+      StreamLocalBindUnlink yes
+      LogLevel VERBOSE
+    '';
+  };
   programs.mosh.enable = true;
 }