Add scaling arguments to celery for yarn dev

package.json

@@ -3,7 +3,7 @@
   "main": "index.js",
   "license": "AGPL-3.0",
   "scripts": {
-    "dev": "concurrently --kill-others --names \"WEBPACK,PYTHON,CELERY\" --prefix-colors \"bgBlue.bold,bgGreen.bold,bgRed.bold\" \"webpack-dev-server --hot --inline --progress --config webpack.dev.js\" \"ZESJE_SETTINGS=$(pwd)/zesje.dev.cfg python3 zesje\" \"ZESJE_SETTINGS=$(pwd)/zesje.dev.cfg celery -A zesje.celery worker\"",
+    "dev": "concurrently --kill-others --names \"WEBPACK,PYTHON,CELERY\" --prefix-colors \"bgBlue.bold,bgGreen.bold,bgRed.bold\" \"webpack-dev-server --hot --inline --progress --config webpack.dev.js\" \"ZESJE_SETTINGS=$(pwd)/zesje.dev.cfg python3 zesje\" \"ZESJE_SETTINGS=$(pwd)/zesje.dev.cfg celery -A zesje.celery worker -l info --autoscale=4,1 --max-tasks-per-child=16\"",
     "build": "webpack --config webpack.prod.js",
     "ci": "yarn lint; yarn test",
     "lint": "yarn lint:js; yarn lint:py",