Add Across in tools page (#320)

* Add Across in tools page

* Add excerpt for Across

Author: abg4

Diff for: src/content/tools/en/across.mdx

@@ -0,0 +1,20 @@
+---
+name: "Across"
+category: ["Bridge"]
+excerpt: "Across is an interoperability protocol powered by intents, enabling the fastest and lowest-cost way to transfer value without security tradeoffs."
+logo: { src: "https://3563890891-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fo33kX1T6RRp4inOcEH1d%2Fuploads%2FYTdMDAZ1jNPOF9bkNdMO%2FAcross%20Logomark%20Aqua%20Circle.png?alt=media&token=6619a5be-ea2a-4967-844e-d07caac3fdc2", alt: "Across Logo" }
+website: "https://across.to/"
+network: ["Mainnet", "Testnet"]
+---
+
+**_Scroll Mainnet contracts:_**
+
+- Scroll_SpokePool:  
+[`0x3baD7AD0728f9917d1Bf08af5782dCbD516cDd96`](https://scrollscan.com/address/0x3baD7AD0728f9917d1Bf08af5782dCbD516cDd96)
+- MulticallHandler:   
+[`0xD2CDF46556543316e7D34e8eDc4624e2bB95e3B6`](https://scrollscan.com/address/0x924a9f036260DdD5808007E1AA95f08eD08aA569)
+
+**_Scroll Sepolia contracts:_**
+
+- Scroll_SpokePool:  
+[`0x95B3A7A7344BBd7b1033275CA3Ce89494baA6A40`](https://sepolia.scrollscan.com/address/0x95B3A7A7344BBd7b1033275CA3Ce89494baA6A40)