Remove org-alert package

Using built-in appt package instead

config/org-mode.org

@@ -158,18 +158,6 @@ Better syncing to mobile, for use with [[https://github.com/orgzly-revived/orgzl
           org-mobile-force-id-on-agenda-items nil)
     (add-hook 'org-capture-finalize-hook #'org-mobile-push))
 #+end_src
-
-* org-alert
-#+begin_src emacs-lisp
-  (use-package org-alert
-    :ensure t
-    :after alert
-    :config
-    (setq org-alert-notification-title "org-mode agenda"
-          org-alert-notify-cutoff 30
-          org-alert-notify-after-event-cutoff 5)
-    (org-alert-enable))
-#+end_src
 * org-journal
 #+begin_src emacs-lisp :results output silent
   (use-package org-journal