Initialize Emacs as fullscreen.

.doom.d/config.el

@@ -50,6 +50,10 @@
 (beacon-mode 1)
 (good-scroll-mode 1)
 
+(custom-set-variables
+ '(initial-frame-alist (quote ((fullscreen . maximized))))
+)
+
 ;; Whenever you reconfigure a package, make sure to wrap your config in an
 ;; `after!' block, otherwise Doom's defaults may override your settings. E.g.
 ;;