lang/org: redo evil integration; add evil-org package

lang/org has now adopted much of evil-org, which introduces better evil
integration for org-mode. More testing is required.

modules/lang/org/packages.el

@@ -7,6 +7,9 @@
 (package! org-bullets :recipe (:fetcher github :repo "hlissner/org-bullets"))
 (package! toc-org)
 
+(when (featurep! :feature evil)
+  (package! evil-org))
+
 (when (featurep! +attach)
   (package! org-download))