docs: add the design language colors

[timowolf]

Describe in detail what your merge request does and why. Add relevant
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[gemini-code-assist]

Summary of Changes

Hello @timowolf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the management of design language colors by introducing a dedicated @siemens-ux/design-tokens package. It refactors the color documentation across various fundamental sections to consume these centralized tokens, enhancing consistency and simplifying future updates to the color palette.

Highlights

• Design Token Integration: The pull request integrates the @siemens-ux/design-tokens package, centralizing the definitions for design language colors.
• Documentation Refactoring: Existing color documentation files, including color-palette.md, data-visualization-colors.md, and ui-colors.md, have been refactored to reference these new external design tokens via si-ref.md.
• NPM Registry Update: A new npm registry entry for @siemens-ux packages has been added to the .npmrc file to support the new dependency.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to align with the new design language colors. It refactors several documentation files to use new color tokens and centralizes the color palette definitions by including them from a single source file. While this is a good step for maintainability, there is a critical issue with a hardcoded local file path in docs/fundamentals/colors/si-ref.md which will break the documentation build for other developers and on CI. Additionally, a color palette definition for 'Orchid' seems to be missing in the updated data-visualization-colors.md file.

[github-actions]

Documentation.
Examples.
Playwright report.

Coverage Reports:

• element-ng
• element-translate-ng

[panch1739]

@timowolf this is perfeeeect! I cross-checked with Figma and it seems all ok :)

Im so glad i dont have to do this manually

[spike-rabbit]

👍

[github-actions]