docs: fix readthedocs link (#67)

* docs: fix readthedocs link

Author: seanmcculloch

README.md

@@ -2,7 +2,7 @@
 
 ## Contributing
 
-Please read: https://docs.allenneuraldynamics.org/en/latest/docs.html 
+Please read: https://docs.allenneuraldynamics.org/en/latest/policies_practices/docs.html
 
 ## Development