[news, idea] Support for Clay (Haskell CSS preprocessor)

Hi,

I've created a small basic package to integrate the Haskell CSS preprocessor [Clay](https://hackage.haskell.org/package/clay) with Servant (similar as for the servant-lucid package for Lucid). See: [https://github.com/l-monnier/servant-clay](https://github.com/l-monnier/servant-clay)

I was wondering if it would be of any interest to have it at some point on Hackage and to the Servant main repo.

Before reaching this stage, it would of course need some more care and an example in Literal Haskell. The purpose is more to demonstrate how it can be done rather than the package in itself as the code is very short and basic. It could however make a first Servant HTML project friendlier to newcomers.