💥 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/editor/lispy/config.el

@@ -1,6 +1,6 @@
 ;;; editor/lispy/config.el -*- lexical-binding: t; -*-
 
-(def-package! lispy
+(use-package! lispy
   :hook ((common-lisp-mode . lispy-mode)
          (emacs-lisp-mode . lispy-mode)
          (scheme-mode . lispy-mode)
@@ -12,7 +12,7 @@
   (setq lispy-close-quotes-at-end-p t)
   (add-hook 'lispy-mode-hook #'turn-off-smartparens-mode))
 
-(def-package! lispyville
+(use-package! lispyville
   :when (featurep! :editor evil)
   :hook (lispy-mode . lispyville-mode)
   :config