refactor(winum): enable preexisting Doom module

It turns out that we don't have to write all this configuration
ourselves, we can just override the `winum` package recipe.

config.org

@@ -975,7 +975,7 @@ ophints
 unicode
 (vc-gutter +pretty)
 vi-tilde-fringe
-;;(window-select +numbers)
+(window-select +numbers)
 workspaces
 ;;zen
 #+end_src
@@ -2392,35 +2392,15 @@ To solve this issue, I've written my own fork of =winum=:
 
 This fork generalizes the window numbering system to support indexing windows with any Lisp object, instead of just integers. We can then index regular windows with integers ~N~, and popup windows with cons cells ~(popup . N)~, allowing us to number them separately.
 
-*** Configuration
+*** Bindings
 
 #+begin_src emacs-lisp
-(use-package! winum
-  :after-call doom-switch-window-hook
-  :config
-  (setq winum-auto-setup-mode-line nil)
-  (winum-mode +1)
-  (map! :map evil-window-map
-        "0" #'winum-select-window-0-or-10
-        "1" #'winum-select-window-1
-        "2" #'winum-select-window-2
-        "3" #'winum-select-window-3
-        "4" #'winum-select-window-4
-        "5" #'winum-select-window-5
-        "6" #'winum-select-window-6
-        "7" #'winum-select-window-7
-        "8" #'winum-select-window-8
-        "9" #'winum-select-window-9)
-  (map! :leader
-        :desc "Select window 1" "1" #'winum-select-window-1
-        :desc "Select window 2" "2" #'winum-select-window-2
-        :desc "Select window 3" "3" #'winum-select-window-3
-        :desc "Select window 4" "4" #'winum-select-window-4
-        :desc "Select window 5" "5" #'winum-select-window-5
-        :desc "Select window 6" "6" #'winum-select-window-6
-        :desc "Select window 7" "7" #'winum-select-window-7
-        :desc "Select window 8" "8" #'winum-select-window-8
-        :desc "Select window 9" "9" #'winum-select-window-9))
+(dolist (n (number-sequence 1 9))
+  (let ((function (intern (format "winum-select-window-%s" n))))
+    (eval
+     `(map! :leader
+            :desc ,(format "Select window %s" n)
+            ,(format "%s" n) #',function))))
 #+end_src
 
 *** Popup Management