Add Notion MCP server fork to README (#3032)

As mentioned in https://github.com/makenotion/notion-mcp-server/issues/142 by @jamiecool, the official open-sourced Notion MCP server does not work well. It returns the raw JSON response from the Notion API, which is way to verbose. This fork of the Notion Server converts read responses to usable Markdown content which is more token efficient.

README.md

@@ -1104,6 +1104,7 @@ A growing set of community-developed and maintained servers demonstrates various
 - **[nomad-mcp](https://github.com/kocierik/mcp-nomad)** - A server that provides a set of tools for managing Nomad clusters through the MCP.
 - **[Notion](https://github.com/suekou/mcp-notion-server)** (by suekou) - Interact with Notion API.
 - **[Notion](https://github.com/v-3/notion-server)** (by v-3) - Notion MCP integration. Search, Read, Update, and Create pages through Claude chat.
+- **[Notion](https://github.com/njbrake/notion-mcp-server)** (by njbrake) - Fork of official Notion MCP Server that returns markdown representation instead of raw json for efficient token usage
 - **[NPM Plus](https://github.com/shacharsol/js-package-manager-mcp)** - AI-powered JavaScript package management with security scanning, bundle analysis, and intelligent dependency management for MCP-compatible editors.
 - **[NS Travel Information](https://github.com/r-huijts/ns-mcp-server)** - Access Dutch Railways (NS) real-time train travel information and disruptions through the official NS API.
 - **[ntfy-mcp](https://github.com/teddyzxcv/ntfy-mcp)** (by teddyzxcv) - The MCP server that keeps you informed by sending the notification on phone using ntfy