Remove more storybook leftovers (#60337)

Release Notes:

- N/A

script/check-keymaps

@@ -5,7 +5,6 @@ set -euo pipefail
 pattern='cmd-'
 result=$(git grep --no-color --line-number --fixed-strings -e "$pattern" -- \
   'assets/keymaps/' \
-  ':(exclude)assets/keymaps/storybook.json' \
   ':(exclude)assets/keymaps/default-macos.json' \
   ':(exclude)assets/keymaps/specific-overrides-macos.json' \
   ':(exclude)assets/keymaps/macos/*.json' || true)

script/storybook

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-if [ -z "$1" ]; then
-    cargo run -p storybook
-else
-    cargo run -p storybook -- "components/$1"
-fi