refactor: deprecate appendq!, prependq!, & delq! macros

In the interest of slimming down Doom's core (as we near v3), I've
deprecated these macros. They doesn't really need to exist. Sure, the
alternatives aren't as ergonomic or elegant, but they're good enough
that we don't need these trivial wrappers. Their local uses have been
refactored out as well.

lisp/doom-editor.el

@@ -644,29 +644,29 @@ on."
   ;; read-only, in `so-long-minor-mode', so we can have a basic editing
   ;; experience in them, at least. It will remain off in `so-long-mode',
   ;; however, because long files have a far bigger impact on Emacs performance.
-  (delq! 'font-lock-mode so-long-minor-modes)
-  (delq! 'display-line-numbers-mode so-long-minor-modes)
-  (delq! 'buffer-read-only so-long-variable-overrides 'assq)
+  (cl-callf2 delq 'font-lock-mode so-long-minor-modes)
+  (cl-callf2 delq 'display-line-numbers-mode so-long-minor-modes)
+  (setf (alist-get 'buffer-read-only so-long-variable-overrides nil t) nil)
   ;; ...but at least reduce the level of syntax highlighting
   (add-to-list 'so-long-variable-overrides '(font-lock-maximum-decoration . 1))
   ;; ...and insist that save-place not operate in large/long files
   (add-to-list 'so-long-variable-overrides '(save-place-alist . nil))
   ;; But disable everything else that may be unnecessary/expensive for large or
   ;; wide buffers.
-  (appendq! so-long-minor-modes
-            '(spell-fu-mode
-              eldoc-mode
-              highlight-numbers-mode
-              better-jumper-local-mode
-              ws-butler-mode
-              auto-composition-mode
-              undo-tree-mode
-              highlight-indent-guides-mode
-              hl-fill-column-mode
-              ;; These are redundant on Emacs 29+
-              flycheck-mode
-              smartparens-mode
-              smartparens-strict-mode)))
+  (cl-callf append so-long-minor-modes
+    '(spell-fu-mode
+      eldoc-mode
+      highlight-numbers-mode
+      better-jumper-local-mode
+      ws-butler-mode
+      auto-composition-mode
+      undo-tree-mode
+      highlight-indent-guides-mode
+      hl-fill-column-mode
+      ;; These are redundant on Emacs 29+
+      flycheck-mode
+      smartparens-mode
+      smartparens-strict-mode)))
 
 
 (use-package! ws-butler