Fix assets compiler error and remove gulp

package.json

@@ -21,7 +21,6 @@
     }
   ],
   "homepage": "https://github.com/mollie/WooCommerce",
-  "main": "gulpfile.js",
   "repository": {
     "type": "git",
     "url": "[email protected]:mollie/WooCommerce.git"
@@ -32,27 +31,18 @@
     "@babel/preset-env": "^7.4.5",
     "@babel/preset-react": "^7.14.5",
     "@playwright/test": "^1.33.0",
-    "@symfony/webpack-encore": "^4.5.0",
+    "@symfony/webpack-encore": "^3.0.0",
     "@woocommerce/dependency-extraction-webpack-plugin": "^1.7.0",
     "@wordpress/data": "^6.1.5",
     "@wordpress/element": "^4.0.4",
-    "date-and-time": "^0.14.0",
-    "del": "^3.0.0",
     "dotenv": "^16.0.0",
-    "gulp": "^4.0.2",
-    "gulp-cli": "^2.0.1",
-    "gulp-help-doc": "^1.1.1",
-    "gulp-rename": "^2.0",
-    "gulp-zip": "^4.2.0",
-    "minimist": "^1.2.3",
-    "pump": "^3.0.0",
     "sass": "^1.52.1",
     "sass-loader": "^7.0.1",
     "wp-pot": "^1.10.2"
   },
   "scripts": {
     "watch": "webpack --watch",
-    "build": "node_modules/.bin/encore dev --env.basePath=.",
+    "build": "node_modules/.bin/encore dev --env basePath=.",
     "setup": "gulp setup",
     "e2e-activation": "npx playwright test --project=activation",
     "e2e-simple": "npx playwright test --project=simple-classic",