fix(docs): corrected references

[mfranzke]

Proposed changes

A lot of README.md links are currently resulting in 404 errors in the rendered documentation.

A good indicator for whether those are working fine is to test whether they work when navigating through the documentation directly in the codebase over the browser in the repository https://github.com/db-ux-design-system/core-web/, as this is a valid use case.

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/fix-docs-corrected-references

[changeset-bot]

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