Stop using helm for yanking

With vertico, using the default `yank-pop` is nice enough.  Furthermore,
yanking with helm does not update the current candidate selection when
in a minibuffer prompt (like for `find-file` or `org-insert-link`),
sometimes leading to confusion.

init.el

@@ -3114,7 +3114,6 @@ eventuelly be set to nil, however)."
     ;; Explicitly require helm, because autoloading is difficult with helm's
     ;; separate `helm-command-prefix-key' mechanism.
     (require 'helm)
-    (bind-key "M-y" #'helm-show-kill-ring)
     (bind-key helm-command-prefix-key #'helm-command-prefix))
 
   (when (package-installed-p 'crux)