added nixos configuration and home mananger stuff

home/terminal.nix

@@ -0,0 +1,10 @@
+{pkgs, ...}: {
+  programs.alacritty = {
+    enable = pkgs.stdenv.isLinux;
+    settings = {}; # TODO: this will be filled in the future
+  };
+
+  programs.kitty = {
+    enable = false; # TODO: to enable later
+  }
+}