Align the navbar to meet the design system requirement

[Dev-JoyA]

Fixes

• Fixes [Feature] Mobile Menu does not match the current Vocabulary design system #817 by @Netacci

Description

This PR updates the navbar to align with the design system and corrects the mobile menu. Specifically, it replaces the hamburger icon with a "Menu" button on smaller screens to ensure consistency with the design system.

Technical details

creativecommons/vocabulary: A cohesive system of design for Creative Commons

Tests

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

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Developer Certificate of Origin

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[TimidRobot]

Please update to use Vocabulary, added in:

• add Vocabulary to web-project to align with design system #832

[TimidRobot]

Thank you for this work!!

(target branch changed to vocab-refresh as the various page parts are interdependent)