Prepare to sanitize docs

[edoaltamura]

Summary

Now that mergify target is updated, update numpy version to stable 0.8..

[coveralls]

Pull Request Test Coverage Report for Build 11801273361

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.214%

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Totals
Change from base Build 11780123711:	0.0%
Covered Lines:	4765
Relevant Lines:	5224

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💛 - Coveralls

[woodsp-ibm]

I am not sure about the mergify config change. This is normally updated on main following a release and does not get on stable until the subsequent release. But I imagine it does no harm as such here since we don;t label things on stable for backporting to the prior versions (look at stable/0.7 mergify which still points to 0.6 for instance). With it modified it would evidently be backporting to itself!

As to the stable tutorial change I guess thats fine. Its not used on stable - its more to check main code against the stable tutorials to ensure no unexpected code breakage with any new changes done on main.

Really I think all what was wanted/needed was the readme and the constraint change as was backported incorrectly in that other PR.