[HelpHub][7.2]: Document Ipsum, the new default theme #2532

Article: N/A — this is a new article, no existing page to link yet

New article

• Write a new HelpHub page for Ipsum, the new default theme, covering its design philosophy, included patterns, and style variations. Model the structure on an existing theme page, such as Twenty Twenty-Five.
• Announcement: Introducing Ipsum
• GitHub Repo: WordPress/ipsum

General

• Add ALT tags for the images
• Make sure the headings are in sentence case
• Start a changelog at the end of the article noting the initial publish date