Refactor some modules

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/sshd/default.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  services.openssh = {
+    enable = true;
+    ports = [ 22 ];
+    openFirewall = true;
+    settings = {
+      PasswordAuthentication = false;
+      PermitRootLogin = "no";
+      PrintMotd = false;
+    };
+  };
+
+  environment.enableAllTerminfo = true;
+}