Remove premature release notes related to MirrorRB

[wshanks]

Notes about MirrorRB and BaseSampler were accidentally committed into the version 0.5 release notes, though the actual MirrorRB experiment has not been added so far.

[coruscating]

Thanks for catching this! Do you want to backport and rebuild the earlier docs as well?

[wshanks]

That sounds good. I added the backport label now. That will get the change into the 0.8 release branch. How do you update the docs without making a new tag and triggering a new release? I think we could add a dummy tag to trigger the CI and that would update the docs while leaving PyPI alone (because there is already a version 0.8.0), but is there a better way?

[coruscating]

@wshanks You should be able to directly trigger a Docs Publish run off of a stable branch without having to change anything.

[wshanks]

Do you think we lost mergify with the move to qiskit-community? I don't see a backport PR.

[coruscating]

Looks like there are multiple issues here: mergify is gone, the post-release PR hasn't been made to bump the package and mergify versions (like #1460), and stable/0.8 doesn't exist because the release bot didn't trigger.

[wshanks]

Okay, I added stable/0.8 and opened #1480 to bump the versions. Mergify should be enabled now. We can try toggling the backport label on this PR after the version bump is merged.

[wshanks]

All taken care of now. Mergify opened the backport PR and the updated docs were deployed by triggering the workflow on the updated stable/0.8 branch. Thanks, @coruscating!