refactor(org): use variables instead of +org-pretty-mode

Toggling +org-pretty-mode on startup is much slower (because
`org-toggle-pretty-entites` and realigning tables can be expensive in
larger Org buffers), so rely on the variables instead.

modules/lang/org/contrib/pretty.el

@@ -11,7 +11,10 @@
 (use-package! org-modern
   :hook (org-mode . org-modern-mode)
   :hook (org-agenda-finalize . org-modern-agenda)
-  :hook (org-modern-mode . +org-pretty-mode)
+  :init
+  (after! org
+    (setq org-hide-emphasis-markers t
+          org-pretty-entities t))
   :config
   ;; HACK: If `org-indent-mode' is active, org-modern's default of hiding
   ;;   leading stars makes sub-headings look too sunken into the left margin.