New branch 9.1.x

[Jennifer Hodgdon]

Hi all! In honor of Drupal 9, I just created (belatedly) a new branch of the User Guide project.

I have just finished running the User Guide tests against Drupal 9.0.6, and there are no changes in the user interface that popped up as test fails. So the 8.x version of the User Guide should mostly be fine for Drupal 9.0.x. The only thing I know about that will not work well is that the Mayo theme is not Drupal 9 compatible (it is used as an example in several places). Because of that, we've created a new theme for Drupal 9 to use as an example, and that will be coming to the User Guide soon. See issue

https://www.drupal.org/project/user_guide/issues/3147404

Since there aren't other needed changes for 9.0.x, and because Drupal 9.1.0 is coming out soon, I decided to create the new branch of the User Guide as 9.1.x -- we will skip 9.0.x and we also didn't have a separate branch/release for 8.9.x.

Starting now, please make new commits in the new 9.1.x branch.

Thanks!

Jennifer