mdbook用のnpm scriptを作成

Author: polyester-CTRL

atcoder-problems-frontend/package.json

@@ -4,13 +4,16 @@
   "private": true,
   "homepage": "https://kenkoooo.com/atcoder",
   "scripts": {
-    "build": "react-scripts build && mkdir -p build/book && mdbook clean ../guide-ja/ -d=../atcoder-problems-frontend/build/book/ && mdbook build ../guide-ja/ -d=../atcoder-problems-frontend/build/book/",
+    "build": "react-scripts build && yarn run md:build",
     "cy:open": "cypress open",
     "cy:run": "cypress run",
     "eject": "react-scripts eject",
     "format": "yarn run sort-package-json && yarn run prettier && yarn run lint:fix",
     "lint": "eslint --ignore-path .gitignore \"./src/**/*.{js,jsx,ts,tsx}\"",
     "lint:fix": "yarn run lint --fix",
+    "md:serve": "mdbook serve ../guide-ja/",
+    "md:clean": "mdbook clean ../guide-ja/ -d=../atcoder-problems-frontend/build/book/",
+    "md:build": "mkdir -p build/book && yarn run md:clean && mdbook build ../guide-ja/ -d=../atcoder-problems-frontend/build/book/",
     "prepare-ci": "rm -rf serve && mkdir serve && cp -r build serve/atcoder",
     "prettier": "prettier --write --ignore-path .gitignore \"**/*.{css,scss,html,js,json,jsx,md,ts,tsx}\"",
     "sort-package-json": "sort-package-json",