Remove expand-region package

It was unused, and is redundant with evil's text object expansion keys.

core/core-editor.el

@@ -269,17 +269,6 @@ savehist file."
         command-log-mode-is-global t))
 
 
-(def-package! expand-region
-  :commands (er/contract-region er/mark-symbol er/mark-word)
-  :config
-  (defun doom*quit-expand-region ()
-    "Properly abort an expand-region region."
-    (when (memq last-command '(er/expand-region er/contract-region))
-      (er/contract-region 0)))
-  (advice-add #'evil-escape :before #'doom*quit-expand-region)
-  (advice-add #'doom/escape :before #'doom*quit-expand-region))
-
-
 ;; `helpful' --- a better *help* buffer
 (def-package! helpful
   :defer t

core/packages.el

@@ -28,7 +28,6 @@
 (package! avy)
 (package! command-log-mode)
 (package! dtrt-indent)
-(package! expand-region)
 (package! helpful)
 (package! pcre2el)
 (package! smartparens)

modules/config/default/+evil-bindings.el

@@ -2,10 +2,6 @@
 
 ;; This file defines a Spacemacs-esque keybinding scheme
 
-;; expand-region's prompt can't tell what key contract-region is bound to, so we
-;; tell it explicitly.
-(setq expand-region-contract-fast-key "C-v")
-
 ;; Don't let evil-collection interfere with certain keys
 (setq evil-collection-key-blacklist
       (list "C-j" "C-k" "gd" "gf" "K" "[" "]" "gz"
@@ -65,12 +61,6 @@
       :i [remap newline] #'newline-and-indent  ; auto-indent on newline
       :i "C-j"           #'+default/newline    ; default behavior
 
-      ;; expand-region
-      :v "v"   (general-predicate-dispatch 'er/expand-region
-                 (eq (evil-visual-type) 'line)
-                 'evil-visual-char)
-      :v "C-v" #'er/contract-region
-
       (:after vc-annotate
         :map vc-annotate-mode-map
         [remap quit-window] #'kill-this-buffer)