feat: ✨ add navigation item template

[auroraVasconcelos]

User Story

As a developer using the Solid Design System, I would like to see how the navigation item works as well as try the keyboard navigation and voice control navigation without having to figure it out on my own.

Suggested Solution

Review navigation concept from product team. Refine navigation concept and add it as a guideline.

Implement figma template in storybook. Figma link

Note: Add the template link as related template in hidden-links and navigation-item docs

Subtasks

• [ ] https://github.com/solid-design-system/solid/issues/1422
• [ ] https://github.com/solid-design-system/solid/issues/1423
• [ ] Development_implementation_task
• [ ] Design_release_task

DoR

• [ ] Item has business value
• [ ] Item all subtasks have been estimated by the team
• [ ] Item is clear and well-defined
• [ ] Item dependencies have been identified

DoD

• [ ] All subtasks have been closed

[EllaELSA]

https://jira.apps.union-investment.de/browse/PB2B-15084 Ticket in the CMS Jira