Housekeeping

- Keep longer undo data, I have run into situations where the history
is too short.
- Clean up undo/redo key bindings.
- Try to make the dashboard package load async and faster. I have seen
it block more than once.

lisp/icejam-dashboard.el

@@ -10,14 +10,13 @@
 
 ;;; Code:
 
-(use-package dashboard :ensure t :demand t
+(use-package dashboard :ensure t :defer t
   :commands dashboard-setup-startup-hook
-  :hook
-  ((elpaca-after-init . dashboard-open))
+  :hook ((elpaca-after-init . dashboard-open))
   :config
   ;; setopt gives a warning here, so let's use setq
   (setq dashboard-footer-messages '("Happy coding!"
-                                   "I showed you my source code, pls respond"))
+                                    "I showed you my source code, pls respond"))
   (setopt dashboard-startup-banner 'logo)
   (setopt dashboard-items '((recents  . 5)
                             ;; (bookmarks . 5)