The great config remake.

I decided to go back to the basics with this one. Only the packages I think
I *REALLY* need (or want) are left, the rest are replaced by the built-in
alternatives or even better, removed.

post-init.el

@@ -1,5 +1,11 @@
 ;;; post-init.el --- This file is loaded after init.el. -*- no-byte-compile: t; lexical-binding: t; -*-
 
+(load-theme 'modus-operandi)
+
+(set-face-attribute 'default nil :height 110 :font "Iosevka Nerd Font" :weight 'normal)
+(setq initial-frame-alist
+      '((width . 100) (height . 25)))
+
 ;; Use straight.el for package management, integrate with use-package.
 (setq straight-use-package-by-default t)
 
@@ -22,18 +28,14 @@
 (unless (memq 'use-package-autoloads features)
   (straight-use-package 'use-package))
 
-;; The compile-angel package automatically byte-compiles and
-;; native-compiles Emacs Lisp libraries. It should be loaded before
-;; any other package.
-(use-package compile-angel
-  :demand t
-  :custom
-  (compile-angel-verbose nil)
-  :config
-  (compile-angel-on-load-mode)
-  (add-hook 'emacs-lisp-mode-hook #'compile-angel-on-save-local-mode))
+;; Minibuffers and stuff
+(setq enable-recursive-minibuffers t)
+(which-key-mode t)
+
+;; Modeline
+(display-time-mode)
+(setq display-time-24hr-format t)
 
-;; Diminish allows us to clear up our modeline
 (use-package diminish
   :ensure t)
 
@@ -41,11 +43,49 @@
 ;; integration to diminish it. So, we do it manually here.
 (diminish 'compile-angel-on-save-local-mode)
 (diminish 'compile-angel-on-load-mode)
-
-;; Since I did not explicitly install it, I cannot use the use-package
-;; integration to deminish eldoc either. So I do it explicitly here.
 (diminish 'eldoc-mode)
 
+;; Avoid backups or lockfiles to prevent creating world-readable copies of files
+(setq create-lockfiles nil)
+(setq make-backup-files nil)
+
+(setq backup-directory-alist
+      `((".*" . ,(expand-file-name "backup" user-emacs-directory))))
+(setq tramp-backup-directory-alist backup-directory-alist)
+(setq backup-by-copying-when-linked t)
+(setq backup-by-copying t)  ; Backup by copying rather renaming
+(setq delete-old-versions t)  ; Delete excess backup versions silently
+(setq version-control t)  ; Use version numbers for backup files
+(setq kept-new-versions 5)
+(setq kept-old-versions 5)
+
+;; Syntax highlights
+(setq treesit-font-lock-level 4)
+
+;; NixOS Specific
+(unless (functionp 'nix--profile-paths)
+  (message "Not on NixOS. Will try to install packages usually managed by it through use-package.")
+  
+  (use-package compile-angel
+    :demand t
+    :custom
+    (compile-angel-verbose nil)
+    :config
+    (compile-angel-on-load-mode)
+    (add-hook 'emacs-lisp-mode-hook #'compile-angel-on-save-local-mode))
+  
+  (use-package vterm
+    :defer t
+    :ensure t)
+
+  (use-package nix-ts-mode
+    :defer t
+    :ensure t))
+
+;; LSP and stuff
+(add-hook 'nix-ts-mode-hook 'eglot-ensure)
+(add-to-list 'auto-mode-alist '("\\.nix\\'" . nix-ts-mode))
+
 ;; Load the configs from plug-in files.
 (let ((config-dir (concat minimal-emacs-user-directory ".config.d")))
   (if (not (file-exists-p config-dir))