Remove doom-major-mode-names & doom|set-mode-name

And replace it with buffer-local mode-name setters. This is more
explicit and less magical, which is easier for users to discover and
change, if they'd like.

modules/lang/emacs-lisp/config.el

@@ -47,6 +47,9 @@
                ("add-hook" "remove-hook")
                ("add-hook!" "remove-hook!")))
 
+  ;; [pedantry intensifies]
+  (setq-hook! 'emacs-lisp-mode-hook mode-name "Elisp")
+
   ;; variable-width indentation is superior in elisp
   (add-to-list 'doom-detect-indentation-excluded-modes 'emacs-lisp-mode nil #'eq)