Add pixi tasks

Author: analog-cbarber

CONTRIBUTING.md

@@ -1,32 +1,20 @@
 # Contributing to mkdocstrings-python-xref
 
-This project's environment and developemtn tasks are managed using [pixi] 
-(previously it used conda and make). 
-
 ## Prerequisites
 
-* [install pixi][pixi-install]
-
-## Development setup
-
-To (re)create a pixi development environment for this project, from inside
-the source tree run:
-
-```
-pixi reinstall
-```
+* [pixi][pixi] [must be installed][pixi-install] on your machine
 
-This is actually optional, since pixi will automatically install the
-environment the first time you run a command. 
+## Development tasks
 
-See `pixi task list` for a list of available tasks.
+All development tasks are managed using [pixi][pixi].
+Use `pixi task list` to see the available tasks.
 
 ## Versioning
 
 The versions will generally track the version of [mkdocstrings_python][] on which it depends.
 
+[pixi]: https://pixi.sh/dev/
+[pixi-install]: https://pixi.sh/dev/advanced/installation/
 [mkdocstrings_python]: https://github.com/mkdocstrings/python
 
 
-[pixi]: https://pixi.sh/latest/
-[pixi-install]: https://pixi.sh/latest/installation/