added changelog for api playground + auth preview deployments

changelog/overview.mdx

@@ -9,7 +9,7 @@
 ## docs.json replacing mint.json
 Upgrades include better multi-level versioning, easier visual comprehension, and more consistent terminology. 
 
-[Update your Mintlify CLI](/settings/global). 
+[Update your Mintlify CLI](/navigation/config-upgrade#upgrading-from-mint-json-to-docs-json). 
 
 ## 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). 
@@ -32,7 +32,17 @@
 - 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. 
+Customize access to any page or section of content depending on user permissions. Supports connecting with your own authentication system.
+
+## Revamped API Playground
+We’ve overhauled the design and performance of the [API Playground](/api-playground/). Updates include:
+
+- Easier detail expansion for an overview of a field
+- More intuitive nested design, e.g. adding or deleting items
+- Faster response times
+
+## Quality Improvements
+- Support for requiring authentication to access preview deployments
 
 </Update>
 
@@ -43,8 +53,6 @@
     </Frame> 
     Make docs private by setting up authentication via JWT, OAuth, or a universal password. With this privacy, you can create an internal knowledge base or prevent competitors from seeing your docs.
 
-
-
 </Update>
 
 
@@ -69,7 +77,7 @@
 
   We've revamped our web editor so that you can now update docs with a fully WYSIWYG experience, while syncing with markdown.
 
   Check out our [docs on getting started with Web Editor](/web-editor).
 
   ## /llms.txt support
 
@@ -145,7 +153,7 @@
 
   When personalization is enabled, search results are now filtered based on the current logged in user so that they only see the relevant content.
 
   ## Custom Prompts for AI Chat
 
   You can now customize the prompts for the AI chat. Please reach out to [support](mailto:[email protected]) if you'd like to customize the prompts.
 
@@ -169,7 +177,7 @@
 
   * Fixed `suggestEdit` not showing up even when enabled.
 
   * Fixed keyboard navigation for Search and Chat such that you can now use the up and down arrow keys to navigate the results.
 
   * Don't allow search engines to crawl user-auth protected pages.
 
@@ -250,7 +258,7 @@
   ## OpenAPI Reference Pages
 
   * Endpoints defined by OpenAPI that are complex and recursive are now 98%
     smaller.
 
   * We now show
     [additionalProperties](https://swagger.io/docs/specification/data-models/dictionaries/)
@@ -286,7 +294,7 @@
 </Update>
 
 <Update label="July 2024">
   ## AI Widget
 
   <Frame>
     <img src="/images/changelog/widget.png" alt="AI Widget" />
@@ -314,7 +322,7 @@
   ## Insights
 
   Currently in beta, this feature summarizes common user questions and patterns
   into easy-to-digest reports with AI-powered suggestions on how to improve your
   product.
 </Update>
 
@@ -323,8 +331,8 @@
 ## Launch Week Highlights
 * Themes: Customize your styling with pre-configured themes. Just add the theme Quill, Prism, or Venus to your `mint.json` file and it'll update your docs styling.
 * Search V2: directly query OpenAPI endpoint descriptions and titles to reach API Reference pages, remove hidden pages from search, and enjoy our updated searchbar UI.
 * Web Editor branching: create branches in our web editor without an IDE.
 * User Personalization: authenticate users with Shared Session or JWT so that you can show them customized content, such as pre-filling API keys or showing specific content for customers.
 * OepenAPI Automation Upgrades: to auto-populate API Playground pages, you can add an `openapi` field to an object in tabs or anchors arrays in the mint.json. 
 
 </Update>
@@ -346,7 +354,7 @@
 Example use cases:
 * Create a custom global landing page setup with custom components
 * Add full-screen videos or image galleries
 * Embed custom iFrame demo elements to add intractability to your docs
 
 Check out our [Custom Mode docs](/page#custom-mode).
 </Update>
@@ -356,7 +364,7 @@
 ## Mintlify MDX for VSCode
 Call snippets of our pre-built components an dcallouts without leaving VSCode. [Install the extension here](https://marketplace.visualstudio.com/items?itemName=mintlify.mintlify-snippets). 
 
 </Update>
 
 <Update label="February 2024">