Fix incorrect port number in MkDocs documentation

- Changed port from 3001 to 7860 to match README and docker-compose.yml
- Registry service actually runs on port 7860, not 3001

Author: aarora79

docs/index.md

@@ -77,10 +77,10 @@ cp .env.example .env
 docker-compose up -d
 
 # 5. Access the registry
-open http://localhost:3001
+open http://localhost:7860
 ```
 
-The registry will be available at `http://localhost:3001` with example MCP servers pre-configured.
+The registry will be available at `http://localhost:7860` with example MCP servers pre-configured.
 
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