Publishing workflow

[Edoardo-Pedicillo]

In this PR, @MatteoRobbiati @alecandido and I have deployed the workflow to publish thelatestand stable Qibo's documentation, and we have made minor fixes to the conf.py file.
Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[Edoardo-Pedicillo]

I have squashed the commits, and only a few of them remain because the rebase generates conflicts.

[Edoardo-Pedicillo]

Now the pre-commit checks have passed, thanks @andrea-pasquale

[scarrazza]

Please follow the approach in #745, or simply remove those changes in this PR.

[MatteoRobbiati]

I suggest to remove them, since I am making these changes in dedicated PR.

[scarrazza]

@MatteoRobbiati thanks but could you please reset conf.py to master so we avoid extra changes?

[MatteoRobbiati]

@MatteoRobbiati thanks but could you please reset conf.py to master so we avoid extra changes?

Now the conf.py file in our fork is identical to qibo's master one. I think this can fix the differences.