This looks great, @acstll! I have some doubts but they're quite simple to resolve.

Testing notes

Showing a bottom bar

Blocking:

The "Showing a bottom bar" example (old docs, new docs) is different. There are no controls anymore and there's no sidebar. But the text says:

Adding an EuiBottomBar can be tricky to use and account for any sidebars. EuiPageTemplate handles this nicely by supplying a EuiPageTemplate.BottomBar component for passing the contents of your bottom bar that extends EuiBottomBar.

Old docs	New docs

Feels to me like we should bring back the sidebar.

Empty pages or content

Non-blocking:

This example looks a bit off and inconsistent with the rest without the "Page title". I'd bring it back.

Old docs	New docs

Looks good! Thank you for the changes, @acstll