[Feature Request] Add history of page editing

[biplobice]

As discussed in #7 (comment)

We may show the history of page editing as following screenshot (i.e. Date, Username, Reason for changes) using concrete5 page versions feature.

Example from MDN web docs.

https://developer.mozilla.org/en-US/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion$history

[aembler]

Seems like a nice idea. In the past we've had a hard time to doing a diff between HTML on a page - so if you can figure that out then go for it!

[wordish]

We have some nice version diff capability now in 9.1.0+