Migrate from straight.el to elpaca.

Idk why, I only can try it.

For now the emacs-init-time whas improved.

configs/lang-rust.el

@@ -11,21 +11,9 @@
 
 (use-package rust-mode
   :defer t
-  :straight t
   :ensure t
   :config
   (setq rust-format-on-save t))
 
-;; Rustic es necesario solamente si se usa lsp-mode + flycheck.
-;; (use-package rustic
-;;   :defer t
-;;   :straight t
-;;   :ensure t
-;;   :config
-;;   ;;(setq rustic-lsp-server 'rls)
-;;   (setq rustic-lsp-client 'lsp)
-;;   ;;(setq rustic-lsp-client nil)
-;;   (push 'rustic-clippy flycheck-checkers))
-
 (provide 'lang-rust)
 ;;; lang-rust.el ends here