fix: update hero image alt text to FlowMCP

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: a6b8

src/content/docs/index.mdx

@@ -5,7 +5,7 @@ template: splash
 hero:
   tagline: Normalize any data source and make it usable for AI agents — with schemas, tools, and the MCP protocol
   image:
-    alt: "AI assistant with open data — 6 sources, one answer"
+    alt: "FlowMCP — AI agents with real data, 4 sources, one answer"
     file: ../../assets/hero-chat.png
   actions:
     - text: Read Docs