Updated readme to note that it's archived

README.md

-edX Insights Early Prototype
-============================
+[ARCHIVED] edX Insights Early Prototype
+=======================================
+
+This repository has been archived and is no longer supported—use it at your own risk.
+This repository may depend on out-of-date libraries with security issues, and security
+updates will not be provided. Pull requests against this repository will also not be merged.
 
 ***Warning***: This repository contains an early prototype of the edX analytics
-infrastructure. edX won't be conitnuing the developing of this source code, but interested parties are free to fork and modify.
+infrastructure. edX won't be continuing the developing of this source code, but interested parties are free to fork and modify.
 
 The code base for the current version of the
 [Insights](http://edx-insights.readthedocs.org/en/latest/) product can