feat(`@vtmn/css`, `@vtmn/svelte`, `@vtmn/react`, `@vtmn/vue`): rework `VtmnNavbarLink` for SSR

[Tlahey]

BREAKING CHANGE: 'VtmnNavbarLink' remove properties label and showLabel, replaced by a span slot

Changes description

Move the Label property into slot in order to apply a sr-only with breakpoints.

Context

With SSR, it is not possible to detect the width of the device. So, in order to avoid flikering effects, we have to set the label on a slot in order to apply style show/hidden on it.

How it looks

On the navbar

Checklist

• [x] Make sure you are requesting to pull a topic/feature/bugfix branch. Please, don't request directly from your main!
• [x] Check commits & PR names matches our requested structure. It must follow the https://www.conventionalcommits.org pattern.
• [x] Check your code additions will fail neither code linting checks.
• [x] I have reviewed the submitted code.
• [x] I have tested on related showcases.
• [x] If it includes design changes, please ask for a review design-system-core-team-design GitHub team.

Does this introduce a breaking change?

• Yes

Other information

Rework the css part and enhancer the CSS in order to match the figma with the VtmnBadge.

Current :

Target :