refactor: streamline core modules into dedicated folder

modules/core/zsh.nix

@@ -0,0 +1,34 @@
+{ lib, pkgs, ... }:
+{
+  programs.command-not-found.enable = false;
+  programs.nix-index-database.comma.enable = true;
+  environment.systemPackages = with pkgs; [
+    # fzf
+    bat
+    duf
+  ];
+  programs.fzf = {
+    keybindings = true;
+  };
+  programs.zsh = {
+    enable = true;
+    autosuggestions = {
+      enable = true;
+      highlightStyle = "fg=#00bbbb,bold";
+    };
+
+    # don't override agdsn-zsh-config aliases
+    shellAliases = lib.mkForce { };
+
+    shellInit = ''
+      zsh-newuser-install () {}
+    '';
+    interactiveShellInit = ''
+      source ${pkgs.zsh-fzf-tab}/share/fzf-tab/fzf-tab.plugin.zsh
+      HW_CONF_ALIASES_GIT_AUTHOR_REMINDER=0
+      source ${pkgs.agdsn-zsh-config}/etc/zsh/zshrc
+    '';
+    promptInit = "";
+  };
+}
+