Strict builds

Four checks are set to fail rather than warn:

Setting	Fails the build when
onBrokenLinks	a link points at a page that does not exist
onBrokenAnchors	a link points at a heading that does not exist
markdown.hooks.onBrokenMarkdownLinks	a relative Markdown link resolves to nothing
markdown.hooks.onBrokenMarkdownImages	an image is missing

The alternative is a warning that scrolls past in a CI log and a published site with dead links.

To be more lenient during a migration:

export default createConfig({
  title: 'voraus.example',
  projectName: 'voraus-example',
  config: { onBrokenLinks: 'warn' },
})