docs: API reference review

[sdiazlor]

Changes

• Configured API references, added missing steps/sections and updated docstrings to render them correctly
• Removed individual LLM Gallery for better maintainability, as there were missing LLMs.
• Minor update to regex in parse_google_docstring used in component_gallery.py, so that examples are rendered in API references and component_gallery
• Added basic contributor docs
• Changed OpenAI in quickstart and README by HF Inference Endpoints.

FYI

• If using \n in examples, it breaks the rendering in docs, so better to use \\n
• Examples should be written without a blank line as:

Examples:
    Bla bla bla
    
    ```python
    pass
    ```

[github-actions]

Documentation for this PR has been built. You can view it at: https://distilabel.argilla.io/pr-932/

[codspeed-hq]

CodSpeed Performance Report

Merging #932 will not alter performance

_{Comparing docs/885-docs-add-tags-for-api (7223d76) with develop (bb14e8b)}

Summary

✅ 1 untouched benchmarks

[davidberenstein1957]

@sdiazlor would you be able to add a google colab button to the first page of the docs, to one of the notebooks you will present during the community?
both
https://distilabel.argilla.io/latest/sections/getting_started/quickstart/
and
https://distilabel.argilla.io/latest/