Update install instructions in README

Makefile

@@ -0,0 +1,6 @@
+.PHONY: default install
+
+default: install
+
+install:
+	emacs --script install.el --kill

README.org

@@ -6,14 +6,5 @@ Personal Emacs config.
 
 Clone to =~/.config/emacs/= (or =~/.emacs.d/=).
 
-To install packages on non-NixOS systems:
-
-#+begin_src emacs-lisp
-  (setq prog-mode-hook nil
-        lisp-data-mode-hook nil)
-  (package-install-selected-packages)
-  ;; Optionally autoremove unneeded packages:
-  (package-autoremove)
-#+end_src
-
-Or just run ~install.el~ for the same effect.
+To install packages on non-NixOS systems run ~make~ (or ~make
+install~), or execute ~install.el~ with Emacs.

init.el

@@ -7,7 +7,7 @@
 (setopt warning-minimum-level :error)
 
 ;; Configure packages archives with priority
-(require 'package-config)
+(load-file "package-config.el")
 
 (setq custom-file (locate-user-emacs-file "custom.el"))
 (when (and custom-file (file-exists-p custom-file))

install.el

@@ -2,7 +2,7 @@
 ;;; Commentary:
 ;;; Code:
 ;; Configure packages archives with priority
-(require 'package-config)
+(load-file "package-config.el")
 (package-refresh-contents)
 (setopt package-selected-packages
         '(