add mkdocs and pre-commit hooks

[AmineDjeghri]

MkDocs is a fast, simple and downright gorgeous static site generator that's geared towards building project documentation. Documentation source files are written in Markdown, and configured with a single YAML configuration file.

• I will integrate this if you are okey with it :
  https://github.com/AmineDjeghri/generative-ai-project-template/blob/main/mkdocs.yml
  The result will be something similar to this : https://aminedjeghri.com/generative-ai-project-template/

• You just need to setup a github page for that and use a command like this or setup a github actions to deploy the pages

[AmineDjeghri]

Done in #371

I also added pre-commit. It flagged the naming of the test files not following the convention:

python tests naming......................................................Failed
- hook id: name-tests-test
- exit code: 1

tests/search.py does not match pattern "test_.*\.py"
tests/cache.py does not match pattern "test_.*\.py"
tests/store.py does not match pattern "test_.*\.py"
tests/llm.py does not match pattern "test_.*\.py"
tests/local.py does not match pattern "test_.*\.py"