added changelog + added a migration guide (#327)

* added changelog + added a migration guide

* fix wording for changelog

* fix code blocks

* add david's suggested changes

* use brand svgs for cards

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Co-authored-by: Hahnbee Lee <[email protected]>

Author: tiffany-mintlify

changelog/overview.mdx

@@ -67,12 +67,16 @@ You can now customize the prompts for the AI chat. Please reach out to [support]
 
 ## Dashboard Improvements
 
+- Added ability to change custom domain to be /docs directly through dashboard settings.
 - Consolidated the login and signup pages to decrease friction and confusion.
 - Implemented the discovery login flow so that users that are members of multiple organizations can now switch between them.
 - Added login with Google OAuth
+- Added ability to add new deployment through dashboard settings.
 
 ## Bug Fixes
 
+- Can now use leading slashes in navigation.
+- Can now edit CSS & JS files in the web editor. 
 - 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.