Update README.md

Author: rob-marcus

README.md

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 Welcome to Political Tardigrade — a web app developed by three Google STEP interns over the course of approximately five weeks in the summer of 2020. The   mission of Political Tardigrade is to compile and highlight overarching trends in America’s political ad space for students, researchers, and advertisers. By making such data more accessible and easy to analyze, this webapp aims to promote sociopolitical awareness. 
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-~~Live link: https://step9-2020-capstone.uc.r.appspot.com/~~ This site is no longer live. 
+The webapp is no longer live. 
 
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