Add changelog

_data/changelogs/about-whats-new.yml

@@ -0,0 +1,9 @@
+title: What's new
+type: documentation
+changelogURL:
+items:
+  - date: 2023-11-21
+    summary: Added release notes section.
+    affectsGuidance: true
+    githubPr: 2318
+    githubRepo: uswds-site

pages/whats-new/overview.md

@@ -17,14 +17,19 @@ redirect_from:
   - /about-our-work/releases
   - /whats-new/
   - /whats-new/releases
+subnav:
+- text: Latest updates
+  href: '#changelog'
 in_page_nav: false
+changelog:
+  key: about-whats-new
 ---
 
 ## Release notes
 
 You can find summaries of bug fixes, new features, and other updates introduced in each release on our [GitHub releases page](https://github.com/uswds/uswds/releases).
 
-Want to learn about new USWDS releases as they are published? You can sign up to be notified of new USWDS releases by setting up [watch notifications](https://docs.github.com/en/account-and-profile/managing-subscriptions-and-notifications-on-github/setting-up-notifications/configuring-notifications#configuring-your-watch-settings-for-an-individual-repository) in the USWDS repository in GitHub. 
+Want to learn about new USWDS releases as they are published? You can sign up to be notified of new USWDS releases by setting up [watch notifications](https://docs.github.com/en/account-and-profile/managing-subscriptions-and-notifications-on-github/setting-up-notifications/configuring-notifications#configuring-your-watch-settings-for-an-individual-repository) in the USWDS repository in GitHub.
 
 <a href="https://github.com/uswds/uswds/releases" class="usa-button site-button">Read the USWDS release notes</a>