chore: update readme to point to js-mono and add refs (#487)

README.md

@@ -5,9 +5,14 @@
 
 ## Statsig JavaScript Client SDK
 
-The JavaScript SDK for single user client environments. If you need a SDK for another language or server environment, check out our [other SDKs](https://docs.statsig.com/#sdks).
+> [!IMPORTANT]
+> This version of the SDK is now in maintainance mode and will only receive bug fixes.
+> All new features will be added to the [@statsig/js-client package](https://github.com/statsig-io/js-client-monorepo).
+> Users of the `statsig-js` npm package should migrate to the `@statsig/js-client` package by 1/31/2025.  See [this migration guide](https://docs.statsig.com/client/javascript-sdk/migrating-from-statsig-js?ref=gh_js).
 
-Statsig helps you move faster with feature gates (feature flags), and/or dynamic configs. It also allows you to run A/B/n tests to validate your new features and understand their impact on your KPIs. If you're new to Statsig, check out our product and create an account at [statsig.com](https://www.statsig.com).
+The JavaScript SDK for single user client environments. If you need a SDK for another language or server environment, check out our [other SDKs](https://docs.statsig.com/#sdks?ref=gh_js).
+
+Statsig helps you move faster with feature gates (feature flags), and/or dynamic configs. It also allows you to run A/B/n tests to validate your new features and understand their impact on your KPIs. If you're new to Statsig, check out our product and create an account at [statsig.com](https://www.statsig.com?ref=gh_js).
 
 ## Getting Started
-Check out our [SDK docs](https://docs.statsig.com/client/jsClientSDK) to get started.
+Check out our [SDK docs](https://docs.statsig.com/client/jsClientSDK?ref=gh_js) to get started.