added changelogs from assistant + partial auth

Author: tiffany-mintlify

changelog/overview.mdx

@@ -3,6 +3,19 @@ title: "Product Updates"
 description: "New updates and improvements"
 mode: "center"
 ---
+<Update label = "January 2024"> 
+
+## AI Assistant Improvements
+- New UI with dedicated chat page & pre-filled prompts
+- Stability improvements, e.g. bug fixes of editing the wrong file or no files at all
+- More robust knowledge for adding & editing components
+- Improved mint.json file editing
+
+## Partial Authentication
+Customize access to any page or section of content depending on user permissions. Supports connecting with your own authentication system. 
+
+</Update>
+
 <Update label="December 2024">
   ## Authentication
     <Frame>