lang/org: major refactor & add org-fancy-priorities package

- Fixes an issue where evil bindings weren't working in org-mode
- Significantly slims down on unnecessary keybinds
- Remove +org-init-keybinds-for-evil-h hook and reli more on our new
  evil-org fork, which has upstreamed some of our changes.
- Documents undocumented functions, remove unnused ones, and reorganize
  org's autoload libraries by convention.
- Adds org-fancy-priorities for more elegant (and subtle) priority
  display than ugly [#A] tags.

modules/lang/org/packages.el

@@ -9,6 +9,7 @@
 
 (package! org-plus-contrib)  ; install cutting-edge version of org-mode
 (package! org-bullets :recipe (:host github :repo "Kaligule/org-bullets"))
+(package! org-fancy-priorities)
 (package! toc-org)
 (when (featurep! :editor evil +everywhere)
   (package! evil-org :recipe (:host github :repo "hlissner/evil-org-mode")))