config: replace dirvish with plain dired

Dirvish caused VoiceOver issues. Plain dired with:
- hide-details, GNU ls sorting, dwim-target
- h/l navigation (vim-style)
- recursive copies, top-level delete confirm

packages.el

@@ -118,5 +118,5 @@
 (package! calfw)
 (package! calfw-org)
 (package! org-roam-ui)
-(package! dirvish)
+;; (package! dirvish)  ; disabled — using plain dired