Remove redundant zoom hydra

It's already available with `text-scale-adjust`, so let's use this.

init.el

@@ -476,7 +476,6 @@ split horizontally again, but this extra work should not matter much."
              db/dired-jump-to-bottom
              db/dired-get-size
              hydra-toggle/body
-             hydra-zoom/body
              hydra-rectangle/body
              hydra-feature-shortcuts/body)
   :autoload (turn-on-flycheck-when-file
@@ -3114,7 +3113,7 @@ eventuelly be set to nil, however)."
   (bind-key "<f1>" #'db/run-or-hide-eshell)
   (bind-key "<f2>" #'hydra-feature-shortcuts/body)
   (bind-key "<f5>" #'project-find-regexp)
-  (bind-key "<f6>" #'hydra-zoom/body)
+  (bind-key "<f6>" #'text-scale-adjust)
   (bind-key "<f7>" #'dictcc)
   (bind-key "<f9>" #'hydra-org-linking/body)
   (bind-key "<f10>" #'magit-status)

site-lisp/db-utils.el

@@ -687,16 +687,6 @@ quite sure whether something like this exists already?"
   ("q" toggle-debug-on-quit "debug-on-quit")
   ("r" read-only-mode "read-only"))
 
-(defhydra hydra-zoom (:color red
-                             :body-pre (require 'face-remap))
-  ;; the following newline is important, as otherwise the format string is not
-  ;; interpreted correctly; cf. https://oremacs.com/2015/02/23/hydra-0.11.0/
-  "
-Zoom (%`text-scale-mode-amount): "
-  ("g" text-scale-increase "increase")
-  ("l" text-scale-decrease "decrease")
-  ("0" (text-scale-adjust 0) "reset"))
-
 (defhydra hydra-rectangle (:body-pre (rectangle-mark-mode 1)
                                      :color pink
                                      :post (deactivate-mark))