Feat: Adds tokens to Navbar

[eduardoformiga]

What's the purpose of this pull request?

This PR applies the new Theming structure to Navbar: new scoped tokens linked to global ones.

It also refactors and split the navbar-related components as NavbarSlider to its own file.

How does it work?

This PR uses local variables to parameterize the Navbar properties, then connects these scoped tokens to the global ones.

Tokens can be visualized in the storybook.

How to test it?

• The Navbar component and its related components should look just as it was before these changes.
• You can check the story on Storybook.

Checklist

Changelog

• Added an entry in the CHANGELOG.md at the beginning of its due section. The latest version should comes first.
• Added the PR number with the PR link at the entry in the CHANGELOG.md. E.g., New items in the pull_request_template.md (#4)

PR Description

• Added a label according to the PR goal - Breaking change, Enhancement, Bug or Chore.
• Added the component, hook, or pathname in-between backticks (``) - If applicable. E.g., ComponentName component.
• Identified the function or parameter in the PR - If applicable. E.g., useWindowDimensions hook.

Documentation

• PR description
• Added to/Updated the Storybook - if applicable.
• For documentation changes, ping @ carolinamenezes, @ PedroAntunesCosta or @ Mariana-Caetano to review and update.

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[renatamottam]

Left some comments below as an effort to simplify these tokens :)

[eduardoformiga]

Left some comments below as an effort to simplify these tokens :)

Thank you, @renatamottam. 💛
I agree with all suggestions.

[renatamottam]

Nice one! Approved with tiny suggestions :)