chore: update readme (#1639)

* chore: update readme

- Add callout re: Control Plane Lite

* Apply suggestions from engg. review

README.md

@@ -266,22 +266,20 @@ rudderanalytics.ready(() => {
 
 > For more information on the other supported methods, refer to the [**JavaScript SDK APIs**](https://docs.rudderstack.com/stream-sources/rudderstack-sdk-integration-guides/rudderstack-javascript-sdk#supported-apis).
 
-## [](https://github.com/rudderlabs/rudder-sdk-js/blob/main/README.md#self-hosted-control-plane)Self-Hosted control plane
+## [](https://github.com/rudderlabs/rudder-sdk-js/blob/main/README.md#self-hosted-control-plane)Self-hosted control plane
 
-If you are using a device mode destination like Heap, FullStory, etc., the JavaScript SDK needs to fetch the required configuration from the [**control plane**](https://docs.rudderstack.com/get-started/rudderstack-architecture#control-plane).
+| **[Control Plane Lite](https://www.rudderstack.com/docs/get-started/rudderstack-open-source/control-plane-lite/) is now deprecated. It will not work with the latest rudder-server versions (after v1.2). Using [RudderStack Open Source](https://www.rudderstack.com/docs/get-started/rudderstack-open-source/control-plane-setup/#rudderstack-open-source) to set up your control plane is strongly recommended.** |
+| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 
-If you are self-hosting the control plane using the [**RudderStack Control Plane Lite**](https://docs.rudderstack.com/get-started/control-plane-lite#what-is-the-control-plane-url) utility, your `load` call will look like the following:
+If you are self-hosting the control plane using the [**Control Plane Lite**](https://www.rudderstack.com/docs/get-started/rudderstack-open-source/control-plane-lite/) utility, your `load` call will look like the following:
 
 ```javascript
 rudderanalytics.load(<WRITE_KEY>, <DATA_PLANE_URL>, {
   configUrl: <CONTROL_PLANE_URL>,
 });
 ```
 
-> More information on how to get the `CONTROL_PLANE_URL` can be found [**here**](https://docs.rudderstack.com/get-started/control-plane-lite#what-is-the-control-plane-url).
-
-| **For detailed technical documentation and troubleshooting guide on the RudderStack’s JavaScript SDK, check out our [docs](https://docs.rudderstack.com/stream-sources/rudderstack-sdk-integration-guides/rudderstack-javascript-sdk).** |
-| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+More information on obtaining the `CONTROL_PLANE_URL` can be found [**here**](https://www.rudderstack.com/docs/resources/faq/#for-a-self-hosted-environment-how-do-i-obtain-the-control-plane-url).
 
 ## Adding your own integrations