docs: update open feature refs to newer package (#1333)

Signed-off-by: Luiz Ribeiro <[email protected]>

website/docs/getting_started/using-openfeature.md

@@ -77,15 +77,15 @@ _In this example we are using the javascript SDK, but it is still relevant for a
 ### Install dependencies
 
 ```shell
-npm i @openfeature/js-sdk @openfeature/go-feature-flag-provider
+npm i @openfeature/server-sdk @openfeature/go-feature-flag-provider
 ```
 
 ### Init your Open Feature client
 
 In your app initialization you have to create a client using the Open Feature SDK and initialize it.
 
 ```javascript
-const {OpenFeature} = require("@openfeature/js-sdk");
+const {OpenFeature} = require("@openfeature/server-sdk");
 const {GoFeatureFlagProvider} = require("@openfeature/go-feature-flag-provider");