Update README.md

Author: kwinkunks

README.md

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 A prompt (reverse) engineering game.
 
 This is a Node application (we only need a backend to deal with the OpenAI API key).
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+**This app is no longer deployed anywhere. A new version of the app, for deployment on Equinor's Radix platform, is here: https://github.com/equinor/what-prompt**