Unconditionally use rgrep when searching for files

This does not exclude files from searches as ag does, and is fast enough for
what I need.

Motivated by https://www.manueluberti.eu//emacs/2021/09/10/rgrep-and-vc-git-grep/.

init.el

@@ -183,7 +183,7 @@
   (bind-key "<f10>" #'magit-status)
   (bind-key "<f1>" #'db/run-or-hide-eshell)
   (bind-key "<f2>" #'hydra-feature-shortcuts/body)
-  (bind-key "<f5>" (if (executable-find "ag") #'counsel-ag #'rgrep))
+  (bind-key "<f5>" #'rgrep)
   (bind-key "<f6>" #'hydra-zoom/body)
   (bind-key "<f7>" #'dictcc)
   (bind-key "<f8>" #'bm-toggle)
@@ -2221,7 +2221,6 @@
 (use-package counsel
   :ensure t
   :commands (counsel-org-goto-all
-             counsel-ag
              counsel-M-x
              counsel-find-file
              counsel-info-lookup-symbol