chore: remove signature.json files

[ac10n]

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[hui-an-yang]

merge conflicts need to be fix and the mentioning of signing packages in readme also need to be removed https://github.com/ecadlabs/taquito#releases

[ac10n]

merge conflicts need to be fix and the mentioning of signing packages in readme also need to be removed https://github.com/ecadlabs/taquito#releases

Nice catch. We should have removed that long ago, when we stopped signing packages. The fact that no one has complained also supports Jev's point that signing does not provide a lot of value.