Haskell `zeromq4-haskell` example present but not showing in site

Haskell example is present in repo but it's not showing in site: [*content/docs/examples/haskell/zeromq4-haskell*](https://github.com/zeromq/zeromq.org/tree/master/content/docs/examples/haskell/zeromq4-haskell)