💥 Rename def-package! -> use-package!

Calling this pivotal macro "def-package!" has frequently been a source
of confusion. It is a thin wrapper around use-package, and it should be
obvious that it is so. For this reason, and to match the naming
convention used with other convenience macros/wrappers, it is now
use-package!.

Also changes def-package-hook! -> use-package-hook!

The old macros are now marked obsolete and will be removed when straight
integration is merged.

modules/ui/doom/config.el

@@ -22,7 +22,7 @@
 ;; Packages
 
 ;; <https://github.com/hlissner/emacs-doom-theme>
-(def-package! doom-themes
+(use-package! doom-themes
   :defer t
   :init
   (unless doom-theme
@@ -40,7 +40,7 @@
     (add-hook 'doom-load-theme-hook #'doom-themes-treemacs-config)))
 
 
-(def-package! solaire-mode
+(use-package! solaire-mode
   :defer t
   :init
   (add-hook 'doom-load-theme-hook