Add excerpt for Across

Author: Alex Gaines

src/content/tools/en/across.mdx

@@ -1,7 +1,7 @@
 ---
 name: "Across"
 category: ["Bridge"]
-excerpt: ""
+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"]