Revision comparison demo content

[thibaudcolas]

We need more revisions demo content, that more realistically represent real-world edits. This is to test Wagtail’s content comparison features, current open issues:

• Revision comparison flags unchanged content #13469
• Revamp revision comparison diff styles #10576

As a first step, we should consider which edits are representative of real-world content changes and the right ones for us to test with. I can imagine edit size is an important factor. Possibly also density of edits (how many are close to one-another that some algorithms might treat them as one edit).

[input]

And another open issue: ListBlock comparison does not indicate reordering #9919