Liesel

What's new?

- :book: Improved documentation (47, 48, jobrachem, hriebl)
- :sparkles: Added convert_dtype to graph builder (50, hriebl)
- :sparkles: [New overview page](https://docs.liesel-project.org/en/latest/tutorials_overview.html) for tutorials (#62, jobrachem)
- ✨ [New tutorial](https://docs.liesel-project.org/en/latest/tutorials/md/07-groups.html) on advanced group usage (#63, jobrachem)
- :sparkles: Added a method to convert sampling results to arviz's inference data (49, wiep)
- :construction: Changes `__repr__` for multiple classes in `liesel.model` (57, wiep)

What's new?

- :truck: The [tutorials](https://docs.liesel-project.org/en/latest/#tutorials) have been updated to v.0.2.2 and are now part of the documentation (jobrachem, wiep, hriebl, GianmarcoCallegher)
- :sparkles: Added [new tutorial](https://docs.liesel-project.org/en/latest/tutorials/md/06-pymc.html) showcasing the interface to PyMC (GianmarcoCallegher)
- :sparkles: Added node / variable groups (28, jobrachem)
- :sparkles: Sampling from the `MultivariateNormalDegenerate` is now possible (34, jobrachem)
- :construction: Fixed undefined behaviour in the distreg module (20, hriebl)
- :construction: The distreg module will now use variables names as position keys (22, hriebl)

[All commits since 0.2.1](https://github.com/liesel-devs/liesel/compare/v0.2.1...v0.2.2)