Replace evil-commentary with evil-nerd-commenter

The latter provides a comment text object and better commenting support
across various languages.

modules/config/default/config.el

@@ -255,9 +255,8 @@
         "s--" #'doom/decrease-font-size
         ;; Conventional text-editing keys & motions
         "s-a" #'mark-whole-buffer
-        :g "s-/" (λ! (save-excursion (comment-line 1)))
-        :n "s-/" #'evil-commentary-line
-        :v "s-/" #'evil-commentary
+        :gn "s-/" #'evilnc-comment-or-uncomment-lines
+        :v  "s-/" #'evilnc-comment-operator
         :gi  [s-backspace] #'doom/backward-kill-to-bol-and-indent
         :gi  [s-left]      #'doom/backward-to-bol-or-indent
         :gi  [s-right]     #'doom/forward-to-last-non-comment-or-eol