Major refactor: use-package-always-defer = nil & use :hook

Possibly breaking change: packages are no longer deferred by default.

Addresses #286

modules/ui/tabbar/config.el

@@ -5,7 +5,6 @@
 ;; find ivy (or helm) or even `buffer-menu' is better suited for this purpose.
 
 (def-package! tabbar
-  :demand t
   :config
   (setq tabbar-use-images nil)
   (tabbar-mode)