Add links to slack mcp by Zencoder (#2364)

Author: alexs-forgood-ai

README.md

@@ -41,7 +41,7 @@ The following reference servers are now archived and can be found at [servers-ar
 - **[Puppeteer](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/puppeteer)** - Browser automation and web scraping
 - **[Redis](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/redis)** - Interact with Redis key-value stores
 - **[Sentry](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/sentry)** - Retrieving and analyzing issues from Sentry.io
-- **[Slack](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/slack)** - Channel management and messaging capabilities
+- **[Slack](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/slack)** - Channel management and messaging capabilities. Now maintained by [Zencoder](https://github.com/zencoderai/slack-mcp-server)
 - **[SQLite](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/sqlite)** - Database interaction and business intelligence capabilities
 
 ## 🤝 Third-Party Servers
@@ -823,6 +823,7 @@ A growing set of community-developed and maintained servers demonstrates various
 - **[Siri Shortcuts](https://github.com/dvcrn/mcp-server-siri-shortcuts)** - MCP to interact with Siri Shortcuts on macOS. Exposes all Shortcuts as MCP tools.
 - **[Skyvern](https://github.com/Skyvern-AI/skyvern/tree/main/integrations/mcp)** - MCP to let Claude / Windsurf / Cursor / your LLM control the browser
 - **[Slack](https://github.com/korotovsky/slack-mcp-server)** - The most powerful MCP server for Slack Workspaces. This integration supports both Stdio and SSE transports, proxy settings and does not require any permissions or bots being created or approved by Workspace admins 😏.
+- **[Slack](https://github.com/zencoderai/slack-mcp-server)** - Slack MCP server which supports both stdio and Streamable HTTP transports. Extended from the original Anthropic's implementation which is now [archived](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/slack)
 - **[Slidespeak](https://github.com/SlideSpeak/slidespeak-mcp)** - Create PowerPoint presentations using the [Slidespeak](https://slidespeak.com/) API.
 - **[Smartlead](https://github.com/jean-technologies/smartlead-mcp-server-local)** - MCP to connect to Smartlead. Additional, tooling, functionality, and connection to workflow automation platforms also available.
 - **[Snowflake](https://github.com/isaacwasserman/mcp-snowflake-server)** - This MCP server enables LLMs to interact with Snowflake databases, allowing for secure and controlled data operations.