Update docs link

README.md

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 A python library for managing authentication, backed by [PropelAuth](https://www.propelauth.com/?utm_campaign=github-python). 
 
-[PropelAuth](https://www.propelauth.com/?utm_campaign=github-python) is a prebuilt, hosted authentication solution focused on a great developer experience. 
+[PropelAuth](https://www.propelauth.com?ref=github) makes it easy to add authentication and authorization to your B2B/multi-tenant application.
+
+Your frontend gets a beautiful, safe, and customizable login screen. Your backend gets easy authorization with just a few lines of code. You get an easy-to-use dashboard to config and manage everything.
 
 ## Documentation