🧹 Moved almost all files to /modules. Moved some code to separate files

modules/terminal/default.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+
+{
+  imports = [
+    ./shell.nix
+  ];
+
+  environment.systemPackages = with pkgs; [
+    kitty
+  ];
+}

modules/terminal/shell.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+
+{
+  programs = {
+    bash = {
+      # Starts the OS using Bash, then starts fish if it's not running
+      interactiveShellInit = ''
+        if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+        then
+          shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
+          exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+        fi
+      '';
+    };
+
+    fish = {
+      enable = true;
+      # Start starship when creating a new shell
+      interactiveShellInit = ''
+        starship init fish | source
+      '';
+      shellAliases = {
+        # Transfer shell config to target device
+        ssh = "kitty +kitten ssh";
+      };
+    };
+  };
+}