docs: add tutorial argilla haystack integration

[sdiazlor]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Closes #4596

Type of change

(Remember to title the PR according to the type of change)

• [x] Documentation update

How Has This Been Tested

(Please describe the tests that you ran to verify your changes.)

• [ ] sphinx-autobuild (read Developer Documentation for more details)

Checklist

• [ ] I added relevant documentation
• [ ] I followed the style guidelines of this project
• [ ] I did a self-review of my code
• [ ] I made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I filled out the contributor form (see text above)
• [ ] I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[sdiazlor]

@davidberenstein1957 I reverted the README, but the Changelog is a pre-commit auto fix of a trailing space.