Add deployment steps

[silvadenisaraujo]

What is the purpose of this pull request?

Improve deployment documentation to ensure we're following the correct steps.

What problem is this solving?

Enables developers to clearly understand the process and run it without issues.

How should this be manually tested?

N/A

Screenshots or example usage

N/A

Types of changes

• [ ] Refactor (non-breaking change that only makes the code better)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] Requires change to documentation, which has been updated accordingly.

Chores checklist

• [ ] Update CHANGELOG.md

[filafb]

There is already a documentation for the deployment here https://github.com/vtex/toolbelt/blob/main/docs/maintaining.md. Not sure it's updated though, but it's better to keep it only in one place.