Remove unit tests from precommit hooks

[astariul]

🔍️ Description

This PR removes pytest from pre-commit hooks. Also update docs.

🧐 Context

See this comment. Basically we don't want to run unit tests in pre-commits, because tests might be slow, but for the sake of developpers, we want fast hooks.

⚠️ Side-effects / Shortcomings

None

✅ How this was tested ?

Docs building locally.

🌱 Checklist

• Perform self-review of my own code
• Comment the code, particularly in hard-to-understand areas
• Update the documentation accordingly to the new code
• Lint / format the code
• Update existing tests / Add new tests
• Tests are passing locally