Add Vizro to README

[maxschulz-COL]

Adding the official Vizro MCP Server (from McKinsey): https://github.com/mckinsey/vizro/tree/main/vizro-mcp

Description

Server Details

• server with 6 tools and 3 templates that allows the creation of validated charts and dashboards
• helps with data reading, config creation, and validation
• previews dashboards without running them locally

Motivation and Context

• fairly novel MCP server in this context (data viz)

How Has This Been Tested?

• tested with Claude Desktop and Cursor
• known bug in tool schema in VS Code

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

[olaservo]

Thanks for your contribution to the servers list. This has been merged in this combined PR: #2144

This is a new process we're trying out, so if you see any issues feel free to re-open the PR and tag me.