chore: add more maintenance notices on the documentation

docs/index.md

diff --git a/docs/index.md b/docs/index.md
index d0d372d..6889df9 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -8,6 +8,10 @@
 
 Bazel rules to build and test code that targets a JavaScript runtime, including NodeJS and browsers.
 
+> 🚨 rules_nodejs is now mostly unmaintained! 🚨
+>
+> See the Maintenance Update in the [root README](https://github.com/bazelbuild/rules_nodejs#maintenance-update)
+
 ## Scope of the project
 
 This repository contains three layers: