docs: Add GIF for Fund card (#1930)

Author: rustam-cb

site/docs/pages/fund/fund-card.mdx

@@ -11,6 +11,10 @@ import FundWrapper from '../../components/FundWrapper';
 
 # `<FundCard />`
 
+<img alt="FundCard"
+  src="https://onchainkit.xyz/assets/fund-card.gif"
+  height="364"/>
+
 The `<FundCard />` component provides a complete fiat onramp experience within your app. It includes:
 
 - Amount input with fiat/crypto switching