docs(tap): add Horizon contract addresses

   - Add TAP Verifier, Subgraph Service, and
   Escrow contract addresses
   - Update config example to use Horizon V2
   addresses
   - Include both mainnet and testnet addresses

Author: suchapalaver

website/src/pages/en/indexing/tap.mdx

@@ -44,7 +44,17 @@ RAV redemption is fully automated when running `indexer-tap-agent` and `indexer-
    - Reverted transactions are resubmitted
    - Confirmed transactions are marked `final`
 
-## Gateway Addresses
+## Blockchain Addresses
+
+### Contracts
+
+| Contract          | Arbitrum Mainnet (42161)                     | Arbitrum Sepolia (421614)                    |
+| ----------------- | -------------------------------------------- | -------------------------------------------- |
+| TAP Verifier      | `0x8f69F5C07477Ac46FBc491B1E6D91E2be0111A9e` | `0x382863e7B662027117449bd2c49285582bbBd21B` |
+| Subgraph Service  | `0xb2Bb92d0DE618878E438b55D5846cfecD9301105` | `0xc24A3dAC5d06d771f657A48B20cE1a671B78f26b` |
+| TAP Escrow        | `0x8f477709eF277d4A880801D01A140a9CF88bA0d3` | `0x1e4dC4f9F95E102635D8F7ED71c5CdbFa20e2d02` |
+
+### Gateway
 
 | Component  | Arbitrum Mainnet                              | Arbitrum Sepolia (Testnet)                    |
 | ---------- | --------------------------------------------- | --------------------------------------------- |
@@ -109,11 +119,13 @@ query_url = "https://api.thegraph.com/subgraphs/name/graphprotocol/graph-network
 
 [blockchain]
 chain_id = 42161
-receipts_verifier_address = "0x33f9E93266ce0E108fc85DdE2f71dab555A0F05a"
+receipts_verifier_address = "0x8f69F5C07477Ac46FBc491B1E6D91E2be0111A9e"
+subgraph_service_address = "0xb2Bb92d0DE618878E438b55D5846cfecD9301105"
 
 # For testnet:
 # chain_id = 421614
-# receipts_verifier_address = "0xfC24cE7a4428A6B89B52645243662A02BA734ECF"
+# receipts_verifier_address = "0x382863e7B662027117449bd2c49285582bbBd21B"
+# subgraph_service_address = "0xc24A3dAC5d06d771f657A48B20cE1a671B78f26b"
 
 [tap]
 max_amount_willing_to_lose_grt = "0.1"