Update link to advance configuration

Previous link https://developmentseed.org/tipg/advanced/configuration/ was outdated. From the documentation page, we should point to: https://developmentseed.org/tipg/user_guide/configuration/.

Author: zacdezgeo

README.md

@@ -83,7 +83,7 @@ Example of `.env` file can be found in [.env.example](https://github.com/develop
 DATABASE_URL=postgresql://username:[email protected]:5432/postgis
 ```
 
-More info about configuration options in https://developmentseed.org/tipg/advanced/configuration/
+More info about configuration options in https://developmentseed.org/tipg/user_guide/configuration/
 
 ## Launch