[doc] #162, #165: Change pre-commit hooks documentation

Update hooks in used
Install pre-commit via 'apt' or pip
Recommended way to install it outside of poetry virtualenv
Document how to 'run' tools installed into pre-commit virtualenv

CONTRIBUTING.md

 # Contribute guide
 
 ## Pre-commit
-We are using [`pre-commit`](https://pre-commit.com/) tool to perform checks on staged changes before committing. Such as black formatting.
-Depending whether you prefer to work ouside or inside Poetry virtual environment, you should stick to one usage or use both to still have this usefull checks.
-`pre-commit` can be used from the installation on your system or from inside Poetry virtual environment where it is installed.
+We are using [`pre-commit`](https://pre-commit.com/) tool to perform checks on staged changes before committing.
+We are using it for `black` formatting, `isort` imports sorting, `pylint` code linting, `mypy` typing, and `gitlab-ci` linting.
+
+Install `pre-commit` from your distribution. In case it is an outdated version, install it from `pip`:
+```bash
+sudo apt install pre-commit
+pip install --user pre-commit
+```
 
 To install the `git-hooks`, run:
 ```bash
-pip3 install --user pre-commit
 duniterpy> pre-commit install
 ```
+Then each time you commit changes, the hooks will perform checks.
 
+To manually run one of the tool above, run (eg for `isort`):
 ```bash
-duniterpy> poetry shell
-(duniterpy-UyTOfZjU-py3.9) pre-commit install
+duniterpy> pre-commit run isort --all-files
 ```
 
 ### Black formatting