feat(Nix): add nix-ts-mode for TreeSitter support in Nix files

docs/emacs/packages/programming.org

@@ -615,6 +615,13 @@ Markdown.
   :defer t)
 #+end_src
 
+#+begin_src emacs-lisp
+(use-package nix-ts-mode
+  :mode "\\.nix\\'"
+  :straight (:build t)
+  :config (add-to-list 'major-mode-remap-alist '((nix-mode . nix-ts-mode))))
+#+end_src
+
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