[doc] #149: Add dev workflow §, Update release workflow

CONTRIBUTING.md

 # Contribute guide
 
+## Development workflow
+Create and push a feature or bugfix release out of the `main` branch.
+Name this branch after the ticket number `###`.
+Open a merge request out of this branch to the `main` branch:
+```bash
+main <− ###_feature_branch
+```
+
 ## Pre-commit
 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.
@@ -56,10 +64,10 @@ Follow [this documentation](https://github.com/Lucas-C/pre-commit-hooks#removing
 Only difference is to update the year in `license_header.txt` rather than `LICENSE.txt`.
 
 ## Release workflow
-To handle a release, you have to respect this workflow:
+To handle a release, you have to follow this workflow:
 
-* Verify all features and bug fixes are merged in the `dev` branch.
-* Checkout on the `dev` branch
+* Verify all features and bug fixes are merged in the `main` branch.
+* Checkout on the `main` branch
 * Update the `CHANGELOG.md` file and commit
 * Run the `release.sh` script with the version semantic number as argument:
 
@@ -67,6 +75,6 @@ To handle a release, you have to respect this workflow:
 ./release.sh 0.50.0
 ```
 
-* A new commit is added with the version number and a tag in git.
-* Merge all new commits from `dev` to `master` on GitLab with a merge request.
-* Release on PyPI from the GitLab pipeline manual job of the `master` branch.
+* Create a MR containing the changelog and the commit updating the version
+* Once the MR is merged to `main`, push the tag with `git push --tags`
+* To release to PyPI, the pipeline based on the tag should be used by triggerring the manual job on the `main` branch