feat: Various completion additions

- Add `vertico-mode` keybindings.
- Unmap `C-k` in insert state.

users/crumb/programs/emacs/modules/syd-evil.el

@@ -37,6 +37,10 @@
   ;; cursor.  Quick fix!  }:P
   (add-hook 'minibuffer-setup-hook
             #'evil-refresh-cursor)
+  ;; Unbind 'C-k'.  Normally, it inserts digraphs; I have a compose key.  It
+  ;; often gets in the way of buffers with navigation, e.g. scrolling through
+  ;; shell/REPL history, navigating Vertico completions, etc.
+  (keymap-set evil-insert-state-map "C-k" nil)
   (evil-mode 1))
 
 ;; A large, community-sourced collection of preconfigured Evil-mode