style(config): Reformat Emacs Lisp code for consistency

Standardize formatting across multiple init files: expand
single-line use-package keywords onto separate lines, fix
indentation, remove outdated comments, and clean up whitespace. Also
adds mc/keymap <return> binding and improves fcitx5 startup logic in
EXWM.

lisp/init-prog.el

@@ -27,7 +27,8 @@
 
 ;; lua
 (use-package lua-ts-mode
-  :mode ("\\.lua\\'" . lua-ts-mode)
+  :mode
+  ("\\.lua\\'" . lua-ts-mode)
   :config
   (add-to-list 'auto-mode-alist '("\\.lua\\'" . lua-ts-mode)))
 
@@ -41,9 +42,12 @@
 
 ;; markdown
 (use-package markdown-mode
-  :mode ("README\\.md\\'" . gfm-mode)
-  :init (setq markdown-command "multimarkdown")
-  :bind (:map markdown-mode-map
+  :mode
+  ("README\\.md\\'" . gfm-mode)
+  :init
+  (setq markdown-command "multimarkdown")
+  :bind
+  (:map markdown-mode-map
               ("C-c C-e" . markdown-do)))