docs(emacs): remove csetq, replace it with setopt

docs/emacs/basic-config.org

@@ -350,47 +350,3 @@ on the matter.
            (unless (string= "-" project-name)
              (format (if (buffer-modified-p) " ◉ %s" "  ●  %s - Emacs") project-name))))))
 #+end_src
-
-** A better custom variable setter
-Something people often forget about custom variables in Elisp is they
-can have a custom setter that will run some code if we set the
-variable properly with ~customize-set-variable~, so ~setq~ shouldn’t be
-the user’s choice by default. But repeatedly writing
-~customize-set-variable~ can get tiring and boring. So why not take the
-best of both world and create ~csetq~, a ~setq~ that uses
-~customize-set-variable~ under the hood while it keeps a syntax similar
-to the one ~setq~ uses?
-#+begin_src emacs-lisp
-(defmacro csetq (&rest forms)
-  "Bind each custom variable FORM to the value of its VAL.
-
-FORMS is a list of pairs of values [FORM VAL].
-`customize-set-variable' is called sequentially on each pair
-contained in FORMS. This means `csetq' has a similar behaviour as
-`setq': each VAL expression is evaluated sequentially, i.e. the
-first VAL is evaluated before the second, and so on. This means
-the value of the first FORM can be used to set the second FORM.
-
-The return value of `csetq' is the value of the last VAL.
-
-\(fn [FORM VAL]...)"
-  (declare (debug (&rest sexp form))
-           (indent 1))
-  ;; Check if we have an even number of arguments
-  (when (= (mod (length forms) 2) 1)
-    (signal 'wrong-number-of-arguments (list 'csetq (1+ (length forms)))))
-  ;; Transform FORMS into a list of pairs (FORM . VALUE)
-  (let (sexps)
-    (while forms
-      (let ((form  (pop forms))
-            (value (pop forms)))
-        (push `(customize-set-variable ',form ,value)
-              sexps)))
-    `(progn ,@(nreverse sexps))))
-#+end_src
-
-I first got inspired by [[https://oremacs.com/2015/01/17/setting-up-ediff/][this blog article]] (archived article, just in
-case) but it seems the code snippet no longer works properly, so not
-only did I have to modify it to make it work with an arbitrary amount
-of arguments (as long as it’s pairs of variables and their value), but
-I also had to make the code simply work.