Automate screenshots and videos

[stevepiercy]

Documentation should have current screenshots of its user interface for its end user manuals, for both Classic UI and Volto. We also want to detect when there is a change in the UI, where the current image differs from the previous one, and have it reported as a warning or error to get the attention of the contributor in a pull request or earlier during testing.

This used to be a feature in Plone 5 documentation, but has since become unsupported. Now there are better tools and there are some efforts already underway.

• At PloneConf 2023, @polyester developed a proof of concept for using Cypress to collect screenshots of the Volto frontend Plone demo at https://demo.plone.org/. Volto already uses Cypress for its GitHub Workflows and automated testing. Further help on bridging the gap to make it use a Docker container would be much appreciated.
• At the Midsummer Sprint 2023, and subsequently at PloneConf 2023, a migration of Classic UI's robot framework tests to Playwright is well under way. @gforcada and @datakurre are the main contributors, along with @thet and @petschki.
• A member from the Python Documentation team suggested using a tool based on Playwright called shot-scraper.
• @stevepiercy is working on a proposal for Google Season of Docs that would include this issue.