Remove visual-fill-column package from Doom core

It is not essential enough to keep in Doom core. I'm working on a new
module (or a rewrite for app/write) to replace it.

core/core-ui.el

@@ -364,14 +364,6 @@ read-only or not file-visiting."
 ;; languages like Lisp.
 (setq rainbow-delimiters-max-face-count 3)
 
-;;;###package visual-fill-column
-;; For a distractions-free-like UI, that dynamically resizes margins and can
-;; center a buffer.
-(setq visual-fill-column-center-text t
-      visual-fill-column-width
-      ;; take Emacs 26 line numbers into account
-      (+ (if EMACS26+ 6 0) fill-column))
-
 
 ;;
 ;;; Line numbers

core/packages.el

@@ -19,7 +19,6 @@
   (package! nlinum-hl)
   (package! nlinum-relative))
 (package! rainbow-delimiters)
-(package! visual-fill-column)
 (package! restart-emacs)
 
 ;; core-editor.el