Update link to TypeScript-Handbook (microsoft#41460)

Author: mattt

Diff for: doc/handbook/README.md

@@ -1,4 +1,5 @@
 # The TypeScript Handbook
 
-The contents of the TypeScript Handbook can be read from [its GitHub repository](https://github.com/Microsoft/TypeScript-Handbook).
-Issues and pull requests should be directed there.
+The contents of the TypeScript Handbook can be found in the
+[TypeScript website repository](https://github.com/microsoft/TypeScript-Website/tree/v2/packages/documentation).
+Issues and pull requests should be directed there.