The block-editor developer handbook still contains references for Puppeteer. Now that the project has been fully migrated to Playwright, these pages need to be updated accordingly.

Incomplete list of documentation pages

• https://developer.wordpress.org/block-editor/explanations/architecture/automated-testing/ - this page can be removed. The handbook already has a "Testing Overview" page.
• https://developer.wordpress.org/block-editor/contributors/code/testing-overview/ - update the e2e test section and reference Playwright in examples.
• https://developer.wordpress.org/block-editor/contributors/code/testing-overview/e2e/ - remove references to Puppeteer and migration.
• https://developer.wordpress.org/block-editor/contributors/code/testing-overview/e2e/migration/ - maybe replace with the "Best Practices" page.