Update README.md

Author: learnyouahaskell

README.md

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 [![Website shields.io](https://img.shields.io/website-up-down-green-red/http/shields.io.svg)](https://learnyouahaskell.github.io/)
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+[![pages-build-deployment](https://github.com/learnyouahaskell/learnyouahaskell.github.io/actions/workflows/pages/pages-build-deployment/badge.svg?branch=main)](https://github.com/learnyouahaskell/learnyouahaskell.github.io/actions/workflows/pages/pages-build-deployment)
 
 # Learn You a Haskell: A community version