Actually, you may build any website using this project. This project is based on react-notion-x which can transform your Notion page into a website just like what the Super.so does.

Subpages is supported in this project. For instance, the About page (roll down to the bottom on the demo Notion page and you will find this page) in the template Notion page is a subpage. If you get any error (like 404), try to redeploy your project.

I also had this issue where subpages (grandchildren of the main page) worked in dev mode but 404'd in prod.

I was able to fix this by updating the maxDepth parameter in get-site-map.ts.

async function getAllPagesImpl(
  rootNotionPageId: string,
  rootNotionSpaceId?: string,
  {
    maxDepth = 3
  }: {
    maxDepth?: number
  } = {}
): Promise<Partial<types.SiteMap>> {
  const pageMap = await getAllPagesInSpace(
    rootNotionPageId,
    rootNotionSpaceId,
    getPage,
    {
      maxDepth
    }
  )

^^^ The original maxDepth was 1, but when I changed it to 3 like above it fixed the issue for me.