Update changelog.mdx

Author: mintlify[bot]

changelog.mdx

@@ -24,12 +24,7 @@ noindex: true
 - Enhanced GIF image processing by skipping costly Imgix auto-formatting to reduce processing time and bandwidth usage
 - Optimized image serving performance with special handling for animated content
 
-## Slack integration updates
 
-- Created comprehensive data models for Writer Slack User to Mintlify User mapping
-- Implemented user authorization system for Slack bot interactions
-- Added login message functionality with proper authentication flow guidance
-- Enhanced security with organization-level access control for Slack users
 
 ## Bug fixes and reliability