Fix Hugo documentation links: homepage URLs, missing sections, and broken references

[Copilot]

Hugo documentation had broken links on homepage (missing /embapi/ base path), unlisted sections, and references to non-existent files.

Changes

Homepage (docs/content/_index.md)

• Changed absolute paths to relative paths to respect Hugo's baseURL
  • /getting-started/ → getting-started/
  • /api/ → api/
  • etc.
• Added missing sections: Development, Deployment, Reference

Guides index (docs/content/guides/_index.md)

• Linked all 8 individual guides (RAG Workflows, Project Sharing, Public Projects, Ownership Transfer, Metadata Validation, Metadata Filtering, Batch Operations, Instance Management)

Concepts index (docs/content/concepts/_index.md)

• Linked all 7 key components (Users, Projects, Embeddings, LLM Services, Similarity Search, Metadata, Architecture)

Broken references

• api/authentication.md: /docs/PUBLIC_ACCESS.md → ../../guides/public-projects/
• api/endpoints/projects.md: /docs/PUBLIC_ACCESS.md → ../../guides/public-projects/
• api/endpoints/llm-services.md: /docs/LLM_SERVICE_REFACTORING.md → ../../concepts/llm-services/ and ../../reference/database-schema/

Example

Before:

- [Getting Started](/getting-started/) - Installation and first steps

After:

- [Getting Started](getting-started/) - Installation and first steps
- [Deployment](deployment/) - Production deployment guide
- [Development](development/) - Contributing and development guide

Screenshots

Homepage with fixed links and added sections:

Guides page with all items linked:

Concepts page with all components linked:

Original prompt

In the docs/hugo website, the links on the homepage are missing the repository name component, i.e. they point to https://mpilhlt.github.io/api/ instead of https://mpilhlt.github.io/embapi/api/ (in the other pages, it seems to be correct). Also, not all areas are linked from the homepage, e.g. development is not, I think there are others that are missing as well. The individual guides in the user guides section are listed but not linked, the same for the key components on the concepts page. Please check that all links are linked and that they point to the correct page/anchor.

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[awagner-mainz]

Looks good.