[Doc] Fix links from gitlab README.md to sphinx documentation

Tobias Meiselrequested to merge
readme_fix_links into main

Fix links from gitlab README.md to sphinx documentation

Developer guide links to latest version.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
  4. API-breaking changes documented here

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