Update goldsky (#1688)

Author: janewang

docs/data/indexers/indexer-providers/indexer-providers.mdx

@@ -9,7 +9,13 @@ To power your applications, a range of data services will be available from data
 
 ### [Goldsky](https://goldsky.com/)
 
-A data pipeline tool allowing you to combine on-chain and off-chain data however you like, streamed directly into your own custom database.
+Goldsky is an indexing provider for Stellar that makes it easy to extract, transform, and load on-chain data to power both application. A data pipeline tool allowing you to combine on-chain and off-chain data however you like, streamed directly into your own custom database. For additional info, please see [relevant docs](https://docs.goldsky.com/chains/stellar) and [tutorial video](https://docs.goldsky.com/chains/stellar#1-deploying-stellar-transactions-using-goldsky-flow).
+
+Select data source: ![Goldsky Datasets](/assets/api/indexer/goldsky1.png)
+
+Select handler or a data sink: ![Goldsky DataSink](/assets/api/indexer/goldsky2.png)
+
+Select a type of data sink: ![Goldsky Yaml](/assets/api/indexer/goldsky3.png)
 
 ### [Mercury](https://docs.mercurydata.app)