Remove express in prod and use serve

package.json

@@ -23,7 +23,7 @@
     "lint:sass": "stylelint ./src/**/**/*.scss ./src/**/*.scss ./src/*.scss",
     "start": "npm run start-dev",
     "start-dev": "webpack-dev-server --config=configs/webpack/dev.js",
-    "serve": "node express.js",
+    "serve": "serve -s -p 3000 dist",
     "start-prod": "npm run build && npm run serve",
     "mock-backend": "json-server --watch db.json -p 1234",
     "test": "npm-run-all lint test:e2e",
@@ -47,7 +47,7 @@
     "babel-preset-env": "^1.7.0",
     "babel-preset-react": "^6.24.1",
     "css-loader": "^0.28.11",
-    "express": "^4.16.3",
+    "dotenv-webpack": "^1.5.7",
     "file-loader": "^1.1.11",
     "fs-extra": "^6.0.1",
     "html-webpack-plugin": "^3.2.0",
@@ -58,6 +58,7 @@
     "npm-run-all": "^4.1.3",
     "plop": "^2.0.0",
     "postcss-loader": "^2.1.5",
+    "prerender-spa-plugin": "^3.2.1",
     "puppeteer": "^1.5.0",
     "react": "^16.4.0",
     "react-addons-test-utils": "^15.6.2",
@@ -76,9 +77,7 @@
     "webpack-cli": "^3.0.3",
     "webpack-dev-middleware": "^3.1.3",
     "webpack-dev-server": "^3.1.4",
-    "webpack-merge": "^4.1.2",
-    "dotenv-webpack": "^1.5.7",
-    "prerender-spa-plugin": "^3.2.1"
+    "webpack-merge": "^4.1.2"
   },
   "dependencies": {
     "axios": "^0.18.0",