Fix Nushell installation failures

[kubouch]

This changes the Nushell installation method to use https://github.com/marketplace/actions/install-development-tools which in turn uses cargo binstall to install Nushell binary directly from GitHub releases. Unlike the previous method which points at https://api.github.com/repos/nushell/nushell/releases/latest this one should point at the build artifacts directly and hopefully avoids the 403 problems.

Also makes the CI script simpler.

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• ran the linter to address style issues (tox -e fix_lint)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation

[kubouch]

There is a failure on MacOS but it seems unrelated to the changes I made.

[kubouch]

OK, I'm falling back to using choco and brew on Windows & Mac so this PR affects only the Linux tests.