Goldsky indexer (#1694)

* Update overview.adoc

add Goldsky

* codereview

---------

Co-authored-by: Raz Landau <125185051+LandauRaz@users.noreply.github.com>

Author: andrew-goldsky

modules/ecosystem/pages/overview.adoc

@@ -71,6 +71,7 @@ https://www.apibara.com/[Apibara^],
 https://checkpoint.box/[Checkpoint^],
 https://dipdup.io/[DipDup^],
 https://www.footprint.network/[Footprint Analytics^],
+https://goldsky.com/chains/starknet[Goldsky^],
 https://subquery.network/[SubQuery^],
 https://thegraph.com/[The Graph^],
 and https://tokenflow.live/[Token Flow^]