chore: declare node >=20, the version the box actually runs - #438

Do not use `window.location.href` to navigate to internal Next.js pages. Use `redirect()` in the render phase, or `useRouter().push()` in Client Components' event handlers instead. See: https://nextjs.org/docs/messages/no-location-assign-relative-destination

Do not use `window.location.href` to navigate to internal Next.js pages. Use `redirect()` in the render phase, or `useRouter().push()` in Client Components' event handlers instead. See: https://nextjs.org/docs/messages/no-location-assign-relative-destination