Update README.md about Countly being shut down

This is in support of the Countly account shutdown discussed in #133

Author: BigLep

README.md

@@ -5,6 +5,9 @@
 
 > UI library for gathering metrics for ignite team projects
 
+# ❗️ Attention: metrics are not being stored ❗️
+As of early February 2024, the backend service account with Countly that was used for collecting data from ignite-metrics has been deactivated.  Data is still being POSTed, but our previous 3rd-party vendor, Countly, is dropping it.  We have a backlog item in [issue #133](https://github.com/ipfs-shipyard/ignite-metrics/issues/133) to move to an alternative service, Plausible.
+
 ## Table of contents <!-- omit in toc -->
 
 - [Install](#install)