update README with archived message

Author: mabuyo

README.md

@@ -1,6 +1,10 @@
+# ARCHIVED
+
+This repo was archived on August 23, 2023. This repo was a companion to the Apollo Fullstack Tutorial, which is now a deprecated course and no longer maintained. If you're looking to learn GraphQL basics with Apollo, [check out the Lift-off series](https://www.apollographql.com/tutorials/lift-off-part1).
+
 # Apollo tutorial
 
-This is the fullstack app for the [Apollo tutorial](https://www.apollographql.com/tutorials/fullstack-quickstart/introduction). 🚀
+This is the fullstack app for the [Apollo tutorial](https://www.apollographql.com/tutorials/fullstack-quickstart). 🚀
 
 ## File structure