Adding forum post link (#497)

Adding link

Author: MichaelMacaulay

website/pages/en/chain-integration-overview.mdx

@@ -2,7 +2,7 @@
 title: Chain Integration Process Overview
 ---
 
-A transparent and governance-based integration process was designed for blockchain teams seeking integration with The Graph protocol. It is a 3-phase process, as summarised below.
+A transparent and governance-based integration process was designed for blockchain teams seeking [integration with The Graph protocol](https://forum.thegraph.com/t/gip-0057-chain-integration-process/4468). It is a 3-phase process, as summarised below.
 
 ## Stage 1. Technical Integration