add clean command back in

Author: gregrickaby

package.json

@@ -21,7 +21,7 @@
     "build-storybook": "build-storybook",
     "chromatic": "npx chromatic --project-token zp8e8oo1lq",
     "clean": "rm -rf .next",
-    "dev": "next dev",
+    "dev": "npm run clean && next dev",
     "develop": "npm dev",
     "export": "next export",
     "format": "npx prettier --config=prettier.config.js '**/*.{js,jsx,ts,tsx,md,html,css,scss,json,yml}' --write || true",