docs: add missing components to overview (#49)

Author: nuke-ellington

docs/components/overview.md

@@ -73,8 +73,10 @@ import { CategoryButton } from '@site/src/components/CategoryButton';
 | [Application menu](./application-menu/index.mdx) | The navigation menu provides direct access to main application parts, legal and version information, and settings. |
 | [Avatar](./avatar/index.mdx) | Avatars visually or textually represent individual identities, typically for users logged into a system. |
 | [Content](./content/index.mdx) | The content component is a simple layout component made for hosting content. |
+| [Content header](./content-header/index.mdx) | Content headers provide a brief overview of the content on a page. |
 | [About and legal](./about-and-legal/index.mdx) | The About and legal component is an overlay we typically use to show application information, application versions, license terms, legal regulations, copyright information and other legal content. |
 | [Settings](./settings/index.mdx) | The settings overlay provides a centralized location for application settings. |
+| [Popover news](./popover-news/index.mdx) | Popover news presents important updates and information when the application starts. |
 
 ## Navigation and hierarchy