Add conceptual intro back to the Gateway builder guide

docs/docs/learn/builder-guides/gateway.md

@@ -6,7 +6,18 @@ sidebar_position: 2
 
 [BOB Gateway](https://docs.gobob.xyz/learn/guides/bitcoin-bridge/) is a Bitcoin intent bridge that unlocks Bitcoin liquidity by reducing the number of steps to onboard users to your app, saving time and money. For example, users can go from **BTC** on Bitcoin to **staked BTC LSTs** with a single Bitcoin transaction.
 
-:::info How does BOB Gateway work?
+Our SDK makes it possible for you to bring this UX directly into your app.
+
+## How Gateway Works
+
+1. Liquidity providers (LPs) temporarily lock wrapped Bitcoin (WBTC or tBTC) in escrow smart contracts on BOB.
+1. A user makes a request for wrapped or staked Bitcoin (e.g. WBTC, tBTC, or a Bitcoin LST/LRT).
+1. The user sends BTC to the liquidity provider's Bitcoin address. A hash of the user's order is included in the `OP_RETURN` of the transaction.
+
+1. Gateway finalizes the transaction. After trustlessly verifying the user's Bitcoin transaction with an on-chain [Light Client](/learn/builder-guides/relay.md), Gateway sends the LP's wrapped Bitcoin to the user's EVM address. If the user requested a Bitcoin LST/LRT, that token is minted using the LP's wrapped Bitcoin before it is sent to the user.
+
+This SDK exposes helper functions for steps 2, 3, and 4 to be used in your application's front end.
+:::info Learn More
 Discover the architecture of BOB Gateway and how it simplifies Bitcoin transactions by visiting our [BOB Gateway introduction page](../introduction/gateway).
 :::