Add pixi, update commands in contributing.

And corresponding pixi cmds.
Delete environment.yml.

CONTRIBUTING.md

@@ -12,13 +12,12 @@ If you've found a bug, please report it to the issue tracker and
 
 #### Installation using pip
 
-To get started, set up a new virtual environment and install all requirements
+To get started, set up a a new environment using [pixi](https://pixi.sh) and install all requirements:
 
 ```bash
-virtualenv plateau-dev --python=python3.9
-source plateau-dev/bin/activate
-pip install -e .
-pip install -r test-requirements.txt
+pixi run pre-commit-install
+pixi run postinstall
+pixi run test
 ```
 
 #### Running tests
@@ -29,37 +28,36 @@ We're using [pytest](https://pytest.org) as a testing framework and make heavy u
 To run the tests simply run
 
 ```bash
-pytest
+pixi run test
 ```
 
 #### Running benchmarks
 
-For performance critical code paths we have [asv](https://pre-commit.com) benchmarks in place in
-the subfolder `asv_bench`.
+For performance critical code paths we have [asv](https://asv.readthedocs.io/en/latest/) benchmarks in place in the subfolder `asv_bench`.
 To run the benchmarks a single time and receive immediate feedback run
 
 ```bash
-asv run --python=same --show-stderr
+pixi run -e benchmark postinstall
+pixi run -e benchmark asv run --python=same --show-stderr --config ./asv_bench/asv.conf.json
 ```
 
 #### Building documentation
 
 ```bash
-python setup.py docs
+pixi run -e docs postinstall
+pixi run docs
 ```
 
 #### Code style
 
-To ensure a consistent code style across the code base we're using `black`, `flake8`,
-and `isort` for formatting and linting.
+To ensure a consistent code style across the code base we're using `prettier` and `ruff` for formatting and linting.
 
-We have pre-commit hooks for all of these tools which take care of formatting
-and checking the code. To set up these hooks, please follow the installation
-instructions on the [pre-commit](https://pre-commit.com) homepage.
+We have [pre-commit](https://pre-commit.com) hooks for all of these tools which take care of formatting
+and checking the code.
 
 If you prefer to perform manual formatting and linting, you can run the necessary
 toolchain like this
 
 ```bash
-pre-commit run -a
+pixi run pre-commit-run
 ```

README.md

@@ -50,3 +50,7 @@ can be installed through `pip`:
 ```bash
 pip install plateau
 ```
+
+## Contributing
+
+Find details on how to contribute [here](CONTRIBUTING.md).