refactor!(parinfer): drop support for parinfer-mode

BREAKING CHANGE: It is no longer maintained, and its author directly
recommends `parinfer-rust-mode`.

Fix #4323

modules/editor/parinfer/config.el

@@ -1,31 +1,6 @@
 ;;; editor/parinfer/config.el -*- lexical-binding: t; -*-
 
-(use-package! parinfer
-  :unless (featurep! +rust)
-  :hook ((emacs-lisp-mode
-          clojure-mode
-          scheme-mode
-          lisp-mode
-          racket-mode
-          hy-mode) . parinfer-mode)
-  :init
-  (setq parinfer-extensions
-        '(defaults
-          pretty-parens
-          smart-tab
-          smart-yank))
-  (when (featurep! :editor evil +everywhere)
-    (push 'evil parinfer-extensions))
-  :config
-  (map! :map parinfer-mode-map
-        "\"" nil  ; smartparens handles this
-        :i "<tab>"     #'parinfer-smart-tab:dwim-right-or-complete
-        :i "<backtab>" #'parinfer-smart-tab:dwim-left
-        :localleader
-        "p" #'parinfer-toggle-mode))
-
 (use-package! parinfer-rust-mode
-  :when (featurep! +rust)
   :when (bound-and-true-p module-file-suffix)
   :hook ((emacs-lisp-mode
           clojure-mode