chore: improve contributors guidelines

[nicoloboschi]

The main point is to remove the dev branch references since some users are not up to date with the latest workflow changes. (e.g. ##2780)

[github-actions]

Pull Request Validation Report

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Whitelist	Active	Result
Pull request is a draft and should be ignored	✅	❌
Pull request is made by a whitelisted user and should be ignored	❌	❌
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Validation Report

Validation	Active	Result
All commits in this pull request has valid messages	❌	✅
Pull request does not introduce too many changes	❌	✅
Pull request has a valid title	✅	✅
Pull request has mentioned issues	❌	✅
Pull request has valid branch name	❌	✅
Pull request should have a non-empty body	✅	✅

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Pull request satisfies all enabled pull request rules.

_{Last Modified at 18 Jul 24 09:34 UTC}

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[ogabrielluiz]

LGTM

Later on we should add more info on how we maintain the branches and things like that.