add link to older repo

Author: poldrack

README.md

@@ -1,3 +1,5 @@
 ## Better Code, Better Science
 
 This repo has been broken into several individual repos that can be found under the [BetterCodeBetterScience Github organization](https://github.com/bettercodebetterscience).  The latest version of the rendered book is now available [here](https://bettercodebetterscience.github.io/book/).  
+
+To access the last version of the repo prior to cleanup and archiving, see [here](https://github.com/poldrack/BetterCodeBetterScience/tree/73b0928aa4e4c3253cb0fd1fb610c41757f2c017).