netlify.toml

[build]
  publish = "exampleSite/public"
  command = "cd exampleSite && hugo --gc --themesDir ../.."

[build.environment]
  HUGO_VERSION = "0.87.0"
  HUGO_THEME = "repo"
  HUGO_BASEURL = "/"

# German subpages 404
[[redirects]]
  from = "/de/*"
  to = "/de/404.html"
  status = 404

# French subpages 404
[[redirects]]
  from = "/fr/*"
  to = "/fr/404.html"
  status = 404

# Italian subpages 404
[[redirects]]
  from = "/it/*"
  to = "/it/404.html"
  status = 404

# all other pages 404 (incl. those in `defaultContentLanguage`)
# NOTE that in case you've set `defaultContentLanguageInSubdir = true` in `config.toml`, you need to change the destination below to point to the `defaultContentLanguage` subdir, e.g. `to = "/en/404.html"`
[[redirects]]
  from = "/*"
  to = "/404.html"
  status = 404