Add execa and deploy script

Author: tomvothecoder

frontend/package.json

@@ -5,7 +5,8 @@
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
-    "lint": "vue-cli-service lint"
+    "lint": "vue-cli-service lint",
+    "deploy": "node scripts/gh-pages-deploy.js"
   },
   "dependencies": {
     "aos": "3.0.0-beta.6",
@@ -28,6 +29,7 @@
     "eslint-plugin-import": "^2.20.2",
     "eslint-plugin-prettier": "^3.1.4",
     "eslint-plugin-vue": "7.1.0",
+    "execa": "latest",
     "vue-template-compiler": "2.6.12",
     "webpack-bundle-tracker": "1.0.0-alpha.1"
   },