feat(editor): Switch from Meow to Evil modal

editing

Change the modal editing system from Meow (QWERTY layout) to Evil mode
with the +everywhere flag for consistent Vim-like keybindings across
Emacs. Also update the theme from modus-vivendi to doom-material-dark.

config.el

@@ -18,7 +18,7 @@
    (add-to-list 'default-frame-alist '(width . 100))))
 
 (setq catppuccin-flavor 'catppuccin)
-(setq doom-theme 'modus-vivendi)
+(setq doom-theme 'doom-material-dark)
 (setq display-line-numbers-type 'relative)
 (setq org-directory "~/org/")