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.

init.el

@@ -53,8 +53,8 @@
        ( zen +mixed-pitch-mode)               ; distraction-free coding or writing
 
        :editor
-       (meow +qwerty)
-       ;; (evil +everywhere)              ; come to the dark side, we have cookies
+       ;; (meow +qwerty)
+       (evil +everywhere)              ; come to the dark side, we have cookies
        file-templates    ; auto-snippets for empty files
        fold              ; (nigh) universal code folding
        (format +onsave +lsp)  ; automated prettiness