added changelogs from assistant + partial auth (#499)

* added changelogs from assistant + partial auth

* added docs.json, checks, + themes from february launches

Author: tiffany-mintlify

changelog/overview.mdx

@@ -3,6 +3,39 @@ title: "Product Updates"
 description: "New updates and improvements"
 mode: "center"
 ---
+
+<Update label = "February 2025">
+
+## docs.json replacing mint.json
+Upgrades include better multi-level versioning, easier visual comprehension, and more consistent terminology. 
+
+[Update your Mintlify CLI](/settings/global). 
+
+## CI Checks
+Automatically lint your docs to find broken links, discover spelling and grammar issues, or enforce writing styles with your own Vale config. Learn more in our [docs](settings/ci). 
+
+## More Themes
+New pre-built themes to modify the look & feel of your docs. Configure via your [docs.json file](/settings/global). 
+
+Now available: 
+- Maple
+- Palm
+
+</Update>
+
+<Update label = "January 2025"> 
+
+## 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>