Add deploy command.

package.json

@@ -4,13 +4,14 @@
   "version": "3.0.0",
   "main": "index.js",
   "scripts": {
+    "deploy": "gh-pages -d build",
     "build": "node scripts/build.js",
     "watch": "node scripts/watch.js",
     "pretest": "npm run build",
     "test": "jest --coverage",
     "test:watch": "jest --watch",
-    "doc:dev": "NODE_ENV=development parcel website/index.html --out-dir build/website --no-cache",
-    "doc:build": "NODE_ENV=production parcel build website/index.html --out-dir build/website --public-url ./ --no-cache"
+    "doc:dev": "NODE_ENV=development parcel website/index.html --out-dir build/ --no-cache",
+    "doc:build": "NODE_ENV=production parcel build website/index.html --out-dir build/ --public-url ./ --no-cache"
   },
   "keywords": [
     "hotkey",
@@ -35,6 +36,7 @@
     "bannerjs": "^1.0.5",
     "classnames": "^2.2.5",
     "colors-cli": "^1.0.13",
+    "gh-pages": "^1.1.0",
     "highlight.js": "^9.12.0",
     "jest": "^22.4.2",
     "less": "^3.0.1",