Replace org-bullets w/ org-superstar

org-superstar is a little faster, better written and still maintained.
It also has a few more features which I've made opt-in because they are
relatively expensive in larger buffers.

Folks that don't care for the differences just have to replace
`org-bullets-bullet-list` in their configs with
`org-superstar-headline-bullets-list`.

modules/lang/org/README.org

@@ -73,7 +73,7 @@ https://www.mfoot.com/blog/2015/11/22/literate-emacs-configuration-with-org-mode
 + [[https://github.com/hniksic/emacs-htmlize][htmlize]]
 + [[https://github.com/astahlman/ob-async][ob-async]]
 + [[https://github.com/alphapapa/org-bookmark-heading][org-bookmark-heading]]
-+ [[https://github.com/sabof/org-bullets][org-bullets]]
++ [[https://github.com/integral-dw/org-superstar-mode][org-superstar]]
 + [[https://github.com/rexim/org-cliplink][org-cliplink]]
 + [[https://github.com/magit/orgit][orgit]]
 + [[https://orgmode.org/][org-plus-contrib]]

modules/lang/org/config.el

@@ -759,8 +759,22 @@ compelling reason, so..."
         (set-marker p nil)))))
 
 
-(use-package! org-bullets ; "prettier" bullets
-  :hook (org-mode . org-bullets-mode))
+(use-package! org-superstar ; "prettier" bullets
+  :hook (org-mode . org-superstar-mode)
+  :config
+  ;; Make leading stars truly invisible, by rendering them as spaces!
+  (setq org-superstar-leading-bullet ?\s
+        org-hide-leading-stars nil)
+  ;; Don't do anything special for item bullets or TODOs by default; these slow
+  ;; down larger org buffers.
+  (setq org-superstar-prettify-item-bullets nil
+        org-superstar-special-todo-items nil
+        ;; ...but configure it in case the user wants it later
+        org-superstar-todo-bullet-alist
+        '(("TODO" . 9744)
+          ("[ ]"  . 9744)
+          ("DONE" . 9745)
+          ("[X]"  . 9745))))
 
 
 (use-package! org-crypt ; built-in

modules/lang/org/packages.el

@@ -34,9 +34,7 @@
 
 (package! avy)
 (package! htmlize :pin "86f22f211e")
-(package! org-bullets
-  :recipe (:host github :repo "Kaligule/org-bullets")
-  :pin "8b4f0aab6d")
+(package! org-superstar :pin "4897c333a8")
 (package! org-yt
   :recipe (:host github :repo "TobiasZawada/org-yt")
   :pin "40cc1ac76d")