Tutorial with screenshots on "about" page?

[mccalluc]

Even if it's easy, people might want a preview before jumping in.

Remember that the --cloud version looks different: Screenshots shown should match current mode.

Screenshot images should probably be PNGs with a reasonable resolution. Watch out for bloat.

Strong preference if the collection of screenshots can be automated, so it doesn't fall out of sync. See https://playwright.dev/python/docs/screenshots

Plan:

• mockup
• get sign-off by Stefano
• implement