title: NextJs - routing gives 404 error in production
body: <p>we launched our small site in production yesterday (it is a static site generated with NextJS and exported), but we have an issue, the routing works well, but when refreshing a page (except the homepage), it returns a 404 error.
  I have tried adding trailSlash to the config, and all the tricks I found here, with no result.
  The website is <a href="https://www.trisgram.com/" rel="nofollow noreferrer">https://www.trisgram.com/</a></p>