Use webpack for bundling

package.json

@@ -1,18 +1,21 @@
 {
   "name": "homepage",
   "author": "Anton Vakhrushev",
-  "license": "MIT",
+  "license": "",
   "version": "1.0.0",
   "description": "Homepage",
   "devDependencies": {
-    "gulp": "^3.9.1",
-    "gulp-autoprefixer": "^3.1.1",
-    "gulp-concat": "^2.6.1",
-    "gulp-sass": "^3.1.0"
+    "css-loader": "^0.28.11",
+    "node-sass": "^4.9.0",
+    "prettier": "^1.12.1",
+    "sass-loader": "^7.0.1",
+    "style-loader": "^0.21.0",
+    "webpack": "^4.5.0",
+    "webpack-cli": "^2.0.14"
   },
   "scripts": {
-    "build": "BUILD_ENV=dev gulp build",
-    "watch": "BUILD_ENV=dev gulp build:watch",
-    "build-prod": "BUILD_ENV=prod gulp build"
+    "watch": "",
+    "build": "webpack --config webpack.config.js --progress",
+    "build-prod": "webpack --config webpack.config.js --env.production"
   }
 }