Update README.md (#2599)

Author: nikhilwoodruff

README.md

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 # Welcome :wave: !
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 This is the official front-end app of PolicyEngine, a non-profit with the mission of computing the impact of public policy for the world. <br/><br/>
 ![PolicyEngineWebApp](https://github.com/PolicyEngine/policyengine-app/assets/14987227/70a1a74f-4585-42ec-8642-e4f4f6c2088b)